Material Standard

Crusher Run & Crush and Run Calculator — Tons, Yards & Coverage

Q: What is the difference between Crusher Run, 3/4" Minus, and DGA?

They are regional names for the exact same aggregate product conforming to ASTM C33 / ASTM D2940. 'Crusher Run' is common in the Northeast and South, '3/4" Minus' is standard in the Pacific Northwest and West, and 'Dense Graded Aggregate (DGA)' is the formal DOT civil engineering specification. All consist of 3/4-inch crushed stone blended down to mineral fines.

Q: Can crushed limestone base be used interchangeably with granite crusher run?

Yes. In driveways, shed pads, and residential parking areas, crushed limestone base and granite crusher run perform identically. Limestone has slightly higher self-hardening calcium fines, while granite offers higher abrasion resistance against studded winter tires.

Q: How much does 1 cubic yard of crusher run weigh in tons?

One cubic yard of compacted in-place crusher run weighs approximately 1.82 tons (3,645 lbs) at standard 135 lb/ft³ Proctor dry density. In its loose, aerated state on a dump truck, it weighs approximately 1.52 to 1.55 tons per cubic yard.

Q: How many square feet will 1 ton of crusher run cover?

At a standard 6-inch compacted driveway depth, 1 ton of crusher run covers approximately 29.5 square feet (accounting for 5% site grading waste). At a 4-inch patio depth, 1 ton covers approximately 44 square feet.

Q: Can crusher run be used as the final driveway surface without asphalt?

Yes. Crusher run is one of the most durable unpaved surface materials available. When crowned properly (2% slope) and rolled at optimum moisture, the mineral fines interlock with the angular aggregate to form an erosion-resistant crust that does not washboard easily.

Q: Should I install geotextile fabric under crusher run?

Yes, especially if the native subgrade consists of wet silt, loam, or clay. A 6 to 8 oz/yd² non-woven geotextile fabric prevents the aggregate from sinking into the subgrade soil while allowing water to drain through freely.

Crusher Run (also marketed as Dense Graded Aggregate / DGA, 3/4" Minus, or Crushed Limestone Base) combines sharp angular rock fragments with quarry fines to create an interlocking, unyielding foundation.

ASTM / AASHTO Verified

Compaction & Waste Factors Included

Dump Truck Capacity Dispatcher

Imperial Standard (yd³ & Tons)

Crusher Run & Crush and Run Calculator — Tons, Yards & Coverage

Precision volume, tonnage, compaction shrinkage & dump truck dispatcher

Material Standard

1. Excavation Area & Compacted Depth

Length (ft)

Width (ft)

Compacted Depth (in)

Project Presets:

2. Compaction Shrinkage (%)

3. Grading & Waste Buffer (%)

Geotechnical Material Density: 135 lb/ft³ (1.82 Tons/yd³)

Compacted Dry Density (lb/ft³)

Material Price ($/Ton)

Material Estimation Output

Total Weight to Order (incl. buffers)

25.1

Tons (approx. 1.3 Tri-Axle Loads)

Compacted In-Place Vol 11.1 yd³ 300 cu ft in place

Loose Delivery Volume 13.8 yd³ +24% combined buffer

Lift Schedule 2 Lifts (3.8" ea) 7.5" total loose spread

Material Subtotal $778.00 Excl. freight & taxes

Engineering Recommendation:

For a 6.0" compacted Crusher Run & Crush and Run Calculator base, spread in 2 separate loose lifts of 3.8". Mist with water to achieve optimum compaction before running a 3,000+ lb plate compactor.

Engineering Data Sheet

Crusher Run Geotechnical Specifications & Material Data Sheet

ASTM C33 / AASHTO M147 Grade B

Compacted Dry Density 135 lb/ft³ (2,162 kg/m³)

Weight per Volume 1.82 Tons / yd³

Sieve Gradation 3/4" (19mm) Down to Zero Fines

Compaction Factor +15% to +20%

Optimum Moisture (OMC) 5.5% – 7.5% by Weight

CBR Bearing Ratio 80% – 100% (High Bearing)

Governing Standard ASTM C33 / AASHTO M147 Grade B

Max Lift Thickness 3" to 4" Maximum per Pass

Permeability Low (0.001 to 0.01 cm/sec)

Angle of Repose 38° – 42° Loose Heap

Plasticity Index PI < 6 (Non-Plastic Fines)

Sand Equivalent (SE) SE > 35

Civil Engineering Math

How to Calculate Crusher Run Volume, Compaction Tonnage & Truckloads

Step-by-step mathematical formulas and worked examples for calculating in-place crusher run volume, loose expansion, and quarry order weights.

1 Surface Area

Area Geometry

Area = Length (ft) × Width (ft)

Determine the square footprint of your driveway, patio, slab, or pad. For curved shapes, break the area into offset rectangles.

2 In-Place Volume

Compact Volume

Vol (yd³) = (Area × Depth_in ÷ 12) ÷ 27

Convert design depth to volumetric units. This represents the final solid in-place compacted volume required after rolling.

3 Compaction Loss

Gross Loose Volume

Loose Vol = Compact Vol × (1 + 18%)

Quarries sell aggregate in its loose, aerated state. Adding 18% accounts for void compression under mechanical vibration.

4 Weight & Ordering

Quarry Tonnage

Tons = Vol (yd³) × 1.82 × 1.05 Waste

Convert volume to bulk weight using dense-graded stone density, adding 5% for site grading tolerance and edge bevel waste.

Real-World Numerical Example

Worked Calculation: 1,000 sq ft Driveway at 6" Compacted Depth

Target Material: Crusher Run & Crush and Run Calculator

✓

Step 1 — Calculate In-Place Volume:

1,000 sq ft × (6 ÷ 12 ft) = 500 cu ft ÷ 27 = 18.52 cubic yards

✓

Step 2 — Apply +18% Compaction & +5% Waste:

18.52 yd³ × 1.18 (shrinkage) × 1.05 (waste) = 22.95 loose cubic yards

✓

Step 3 — Convert to Quarry Scale Weight (1.82 Tons / yd³):

18.52 compacted yd³ × 1.82 Tons/yd³ × 1.05 waste = 35.4 Tons quarry weight (arrives as 22.95 loose yd³)

✓

Step 4 — Calculate Hauling & Estimated Material Cost:

42 Tons ÷ 20-ton Tri-Axle = 3 Dump Truck Loads | Quarry Stone Cost: ~$1302

Order Sheet Summary

Total Order Weight: 41.8 Tons

Loose Volume: 23.0 yd³

Truckloads Required: 3 Tri-Axle Loads

Estimated Quarry Price: $1302

ASTM C136 / AASHTO T27 Lab Standard

Crusher Run Sieve Gradation & ASTM C136 Grain-Size Distribution

Laboratory grain-size distribution for 3/4" Minus Crusher Run. Inspect how aggregate skeleton and mineral fines interlock under vibration.

Standard Sieve Size % Passing (Design Target)

1 1" (25.0 mm)

Spec: 100% 100%

2 3/4" (19.0 mm)

Spec: 90% – 100% 95%

3 3/8" (9.5 mm)

Spec: 50% – 75% 63%

4 No. 4 (4.75 mm)

Spec: 35% – 55% 45%

5 No. 40 (425 µm)

Spec: 15% – 30% 22%

6 No. 200 (75 µm)

Spec: 5% – 12% 8%

Selected Sieve Analysis Spec: 100%

1" (25.0 mm)

Target Percent Passing

100%

Geotechnical Function:

Maximum top size; 100% must pass to prevent oversize stone jamming.

Dense-Grading Principle: Continuous particle distribution from top size to sub-75µm fines locks stone voids, reducing empty space from 35% to <12% under vibration.

Road Base Calculator Standards & Editorial Desk

Standards-Based

All mathematical models, dry densities, and lift schedules published on Road Base Calculator are derived directly from published civil engineering standards: AASHTO M147, ASTM C33 / D2940, ASTM D698 / D1557, and state DOT specifications. Read our Methodology and our Editorial & Review Policy. Have a quarry test report or correction? Submit a correction.

• AASHTO M147 Compliant • ASTM C136 Sieve Analysis • ASTM D698 / D1557 Proctor Compaction • State DOT Calibrated (TxDOT, Caltrans, VDOT, CDOT)

Structural Pavement Section

Crusher Run Structural Layer Cross-Section & Subgrade Profile

Engineering layer breakdown from wearing surface down through compacted crusher run lifts, geotextile membrane, and proof-rolled native subgrade.

Wearing Surface Course

Hot Mix Asphalt / Pavers / Chip Seal

2.0" – 3.0" Surface Layer

Crusher Run Base Course (Top Lift)

3/4" Crusher Run / DGA

3.0" Compacted 98% Modified Proctor

Crusher Run Base Course (Bottom Lift)

3/4" Crusher Run / DGA

3.0" Compacted 95% Modified Proctor

Separation Geotextile Membrane

Non-Woven Polypropylene Geotextile

4–6 oz / yd² Class 1 Fabric

Compacted Native Subgrade

Proof-Rolled Native Soil / Clay

6.0" Minimum 95% Standard Proctor

Layer Inspection 2.0" – 3.0"

Wearing Surface Course

Hot Mix Asphalt / Pavers / Chip Seal

Compaction Standard: Surface Layer

Engineering Function & Placement:

Top riding surface protecting road base from tire shear and water penetration.

Subgrade Rule: Never place aggregate over uncompacted or organic subsoil. Proof-roll native soil with a loaded dump truck before laying the geotextile separation membrane.

Structural Depth Schedules

Recommended Crusher Run Thickness & Depth by Application

Standard engineering thickness schedules for crusher run across driveways, parking pads, shed foundations, and walkways.

Structural Depth & Lift Schedule by Use Case

Recommended compacted thickness and placement lift sequences

AASHTO / ICPI Guidelines

Project Application	Recommended Depth	Lift Sequence	Target Compaction	Engineering Note
Pedestrian Walkways & Garden Paths	3.0 – 4.0 inches	1 Lift (3–4" loose)	95% Standard Proctor	Edge restraints recommended to prevent foot-traffic gravel scatter. Geotextile optional on firm soil.
Paver Patio & Outdoor Living Slabs	4.0 – 6.0 inches	1–2 Lifts (3" compacted each)	98% Modified Proctor	Top with 1.0 inch of ASTM C33 concrete bedding sand. Screed flat without compacting sand prior to paver placement.
Light Residential Driveways (Cars & SUVs)	6.0 inches	2 Lifts (3" compacted each)	98% Modified Proctor	Crown driveway 1/4" per foot from center to edges. Install 4–6 oz non-woven geotextile over clay subgrades.
Heavy Vehicle, RV & Boat Storage Pads	8.0 – 10.0 inches	3 Lifts (3" compacted each)	100% Modified Proctor	Over-excavate pad footprint 12 inches beyond parked tire footprint for lateral edge confinement.
Shed, Pole Barn & Equipment Foundations	5.0 – 6.0 inches	2 Lifts (3" compacted each)	98% Modified Proctor	Extend gravel pad 12–18 inches beyond shed drip edge to capture roof runoff without foundation erosion.
Commercial Parking Lots & Highway Sub-Base	10.0 – 14.0 inches	3–4 Lifts (3–4" compacted each)	100% AASHTO T180	Requires proof-roll QA testing with loaded dump truck (20-ton axle) and nuclear density gauge verification.

Geotechnical Subgrade Rule

Subgrade Soil Adjustments & Geotextile Requirements

ASTM D1883 Subgrade Evaluation

CBR > 15%

Dense Gravel / Coarse Sand Subgrade

Base Depth Mod: Standard design depth (0" added)

Geotextile: Optional / Not Required

CBR 6% – 10%

Firm Silt / Sandy Loam Subgrade

Base Depth Mod: +1.0 to +2.0 inches extra base

Geotextile: Recommended (4 oz Fabric)

CBR 2% – 4%

Expansive Clay / Black Cotton Soil

Base Depth Mod: +2.0 to +4.0 inches extra base

Geotextile: Mandatory (6 oz Non-Woven Geotextile)

CBR < 2%

Wet Saturated / Organic Muck Subgrade

Base Depth Mod: +4.0" to +6.0" Base + 4" Surge Stone

Geotextile: Mandatory (Class 1 Geotextile + Biaxial Geogrid)

Field Compaction & Moisture Control

Crusher Run Compaction Mechanics, Moisture Conditioning & Lift Thickness

Moisture-density relationship and lift thickness simulator for crusher run. Discover how 6.5% OMC moisture and plate passes achieve 98% Modified Proctor density.

1. Loose Lift Thickness (Inches) 4.0" Loose Lift

2.0" (Hand Tamper) 4.0" (Max Plate Compactor) 6.0" (Small Roller) 8.0" (Heavy 5-Ton Roller)

2. Moisture Content (% by Dry Weight) 6.5% OMC (Optimum)

2% (Too Dry / Friction) 6.5% (Optimum Peak) 12% (Over-Saturated / Pumping)

Compaction Result: Optimal 98% Proctor

At 6.5% moisture and 4.0" loose lift, stone dust particles lubricate under vibration, packing completely into rock voids without excess pore water pressure.

Field Compaction Parameters

Target Proctor Density: 98% Modified Proctor (ASTM D1557)

Compaction Shrinkage: +18% extra loose volume

Water Dosage per 100 sq ft: ~18 Gallons

Compactor Passes: 4 to 6 passes with 3,000+ lb vibratory plate

Recommended Machinery:

Forward-reversible plate compactor (35–45 kN centrifugal force) or 1.5-ton double drum roller.

Hauling Logistics & Site Access

Crusher Run Dump Truck Delivery Loads & Site Clearance Guide

Calculate payload capacities across single axle, tandem, tri-axle, and semi end-dump trucks for crusher run deliveries.

Selected Vehicle Specification

Tri-Axle Commercial Dump Truck

Most economical rate per ton (Contractor standard)

Payload Weight 18–22 Tons

Payload Volume 11–13.5 yd³

Clear Gate Width 12 ft Min

Overhead Wire Clear 24 ft Raised

Site Access Rule: A loaded tri-axle weighs ~65,000 lbs (32.5 tons gross). Ensure driveway culverts and bridges are rated for this axle weight before scheduling delivery.

Delivery Site Checklist:

Check overhead tree branches and power/phone wires.

Mark septic tanks, leach fields, and sprinkler heads.

Never dump on a cross-slope >8% (dump bed tip-over risk).

Have driver tailgate-spread stone in a thin pass to save shovel time.

Budget & Labor Estimator

Crusher Run Cost Estimator: Quarry Pricing, Freight & DIY vs Contractor Budget

Estimate crusher run quarry prices ($24–$38/ton), local freight hauling fees, compactor rentals, and contractor installation costs.

1. Total Project Area (Square Feet) 1,000 sq ft

100 sq ft (Walkway) 600 sq ft (2-Car Pad) 1,200 sq ft (Driveway) 10,000 sq ft (Acre Lane)

2. Material Quarry Price ($ / Ton) $31 / Ton

$15/Ton (Pit Direct Caliche/RCA) $31/Ton (Avg Crusher Run) $75/Ton (Imported Granite)

Equipment & Hauling Options:

Delivery Fee (per truckload)

Equipment Rental

DIY vs Contractor Cost Comparison

DIY Total Cost (Materials + Rental + Delivery)

$1,444

~$1.44 per square foot

Contractor Turnkey Cost (Excavation + Install + Base)

$5,500

~$5.50 per square foot ($4.50 – $7.50 / sq ft range)

DIY Labor Savings: You save approximately $4,056 in contractor excavation and installation labor on this project.

Material Selection Matrix

Crusher Run vs. Alternative Aggregate Base Comparison

Head-to-head engineering comparison between Crusher Run (DGA), Clean #57 stone, Decomposed Granite, and Recycled Concrete (RCA).

Material Type	CBR Bearing Ratio	Compacted Density	Permeability	Avg Cost / Ton	Recommended Application
3/4" Crusher Run / DGA This Page	85% – 100%	135 lb/ft³	Low (Dense)	$28 – $36	Driveway base, shed pads, road foundations, parking lots
Clean #57 Crushed Stone	60% – 70%	105 lb/ft³	High (Free Draining)	$32 – $44	French drains, retaining wall backfill, pipe bedding
Decomposed Granite (DG)	40% – 60%	115 lb/ft³	Moderate	$45 – $70	Garden pathways, bocce courts, rustic decorative walkways
Recycled Concrete (RCA)	90% – 110%	125 lb/ft³	Low-Moderate	$18 – $26	Budget sub-base, commercial yards, heavy equipment pads

Quality Assurance & Failure Prevention

Crusher Run Field Quality Control, Compaction Testing & Troubleshooting

Contractor field testing protocols (Hand Squeeze OMC, Proof-Rolling, Heel-Strike) and remediation procedures for soft spots and rutting.

4 Contractor Field Tests to Verify Density (Without Nuclear Gauge)

💧

Hand-Squeeze Moisture Test (OMC)

Field Test

Target: Verify 5.5%–7.5% Optimum Moisture Content before rolling

Execution Procedure: Grab a fistful of loose crusher run from the spread lift. Squeeze firmly in a closed hand and open your fingers.

Pass: Material binds into a firm, cohesive ball that does not crumble or smear liquid mud on the palm. Fail: Crumbles like dry sand (too dry) or leaves muddy water (too wet).

🚛

Proof-Roll Axle Deflection Test

Field Test

Target: Verify subgrade stability and base bearing under heavy wheel loads

Execution Procedure: Drive a loaded tandem dump truck (minimum 10-ton rear axle) slowly across the finished compacted surface.

Pass: Wheel rutting is under 1/4 inch (6mm) with zero visible elastic pumping or heaving alongside tires. Fail: Tires create ruts > 1/2 inch or wave ripples appear.

🔍

Angular Sieve Skeleton Inspection

Field Test

Target: Confirm even distribution of 3/4" stone and fines without segregation

Execution Procedure: Inspect the spread lift surface before rolling to ensure quarry fines haven't separated from coarse stone.

Pass: Uniform mosaic of coarse stone with voids completely filled by limestone/granite dust. Fail: Pockets of clean stone (honeycombing) or patches of pure dust.

🔨

Steel Rebar Penetration Check

Field Test

Target: Verify uniform interlock through full lift thickness

Execution Procedure: Push a standard 1/2-inch (#4) steel rebar probe into the compacted base using two-handed body weight.

Pass: Rebar stops within 1/2 inch of the surface. Fail: Rebar easily penetrates more than 1.5 inches into the stone matrix.

Troubleshooting Protocols

Common Road Base Failure Modes & Remediation

Field Repair Checklist

Surface Ravelling & Loose Dust Kick-Up

Moderate Severity

Root Cause:

Material was compacted while bone-dry, preventing mineral fines from bonding.

Contractor Solution & Fix:

Heavily spray with a water truck spray bar or garden misting nozzle to 6% OMC. Lightly scarify top 1.5 inches with rake teeth, then make 4 overlapping vibratory roller passes.

Soft Subgrade Pumping & Springiness

Critical Severity

Root Cause:

Saturated native clay beneath the base is flexing under compactor vibration.

Contractor Solution & Fix:

Halt rolling immediately. Allow surface to air dry for 24–48 hours. If pumping persists, excavate 6 inches, install non-woven geotextile fabric, and place 4 inches of clean 3-inch ballast stone before re-installing base.

Longitudinal Wheel Rutting in Traffic Path

High Severity

Root Cause:

Base was spread in a single lift exceeding 5 inches, leaving bottom aggregate uncompacted.

Contractor Solution & Fix:

Excavate the rutted track. Re-spread in maximum 3.5-inch loose lifts and compact each lift individually to 98% Proctor.

Edge Washout & Shoulder Slumping

Moderate Severity

Root Cause:

Driveway lacks lateral shoulder support and water runoff is cutting along edges.

Contractor Solution & Fix:

Excavate base trench 12 inches wider than finished drive width. Install 3:1 compacted soil shoulder berms or rigid timber restraints.

Field Construction Standard

Step-by-Step Crusher Run Driveway Installation & Compaction Guide

Professional contractor installation sequence from subgrade excavation and geotextile pinning to lift misting, crowning, and finish rolling.

Stage 1 · Day 1 (Morning)

Excavation & Subgrade Proof-Rolling

QA Checkpoint

Excavate native earth to design depth (typically 8" below finished grade to allow 6" base + 2" surface). Remove all topsoil, roots, and organic muck. Proof-roll with a loaded dump truck or heavy roller to identify and dig out soft pumping clay pockets.

Pro Contractor Tips:

Dig 6 inches wider than finished driveway on both sides for lateral edge support.

Never install aggregate over frozen ground or standing mud.

Pass/Fail Verification Standard Proof-roll test: No tire ruts exceeding 0.5 inches under 10-ton axle load.

Stage 2 · Day 1 (Midday)

Geotextile Separation Fabric Installation

QA Checkpoint

Roll out non-woven 4–6 oz geotextile fabric along the excavated subgrade. Overlap roll edges by 18–24 inches. Pin with landscape staples to prevent shifting during aggregate dumping.

Pro Contractor Tips:

Geotextile stops heavy crusher run stones from sinking into soft subsoil over years of rain.

Run fabric up the excavation trench sidewalls 4 inches.

Pass/Fail Verification Standard Fabric is taut, free of wrinkles, and overlapped generously.

Stage 3 · Day 1 (Afternoon)

First Lift Spreading & Moisture Conditioning

QA Checkpoint

Tailgate dump or spread first 4-inch loose lift using a skid steer or box blade. Mist surface with garden hose until aggregate reaches Optimum Moisture Content (~6% by weight). Hand-squeeze a fistful: it should clump firmly without oozing water.

Pro Contractor Tips:

Never compact bone-dry crusher run; dust will bridge and form hollow pockets.

Work backward toward the entrance to avoid driving over uncompacted loose stone.

Pass/Fail Verification Standard Hand-squeeze clump test passed: ball remains solid when opened.

Stage 4 · Day 1 (Late Afternoon)

Vibratory Compaction of First Lift

QA Checkpoint

Run a 3,000+ lb plate compactor in overlapping parallel strips. Complete 4 passes lengthwise and 2 passes crosswise. Compact until machine stops making indentations and begins vibrating across the surface.

Pro Contractor Tips:

Overlap compactor plate width by 50% on every pass.

Pay special attention to edges where vehicles will enter and exit.

Pass/Fail Verification Standard Heel-strike test: Stepping heavily on the compacted lift leaves no visible foot impression.

Stage 5 · Day 2

Second Lift, Crowning & Final Finish Roll

QA Checkpoint

Spread final 4-inch loose lift (compacts to 3"). Grade a 1/4" per foot transverse crown (center 2" higher than edges on a 16-ft driveway) to shed stormwater into side swales. Mist and compact with 6 full passes.

Pro Contractor Tips:

A crowned road base prevents center puddles, which are the #1 cause of driveway potholes.

Seal edges with compacted topsoil shoulders.

Pass/Fail Verification Standard Crown check: 2% slope from centerline to each outer edge verified with string line.

Geotechnical Engineering Guide

Comprehensive Engineering Manual: Crusher Run (Dense Graded Aggregate)

In-depth technical reference on particle mechanics, shear resistance, moisture-density physics, DOT specifications, and subgrade stabilization.

Particle Mechanics Civil Standard Section 01

The Physics of Dense Graded Aggregate (3/4" Minus & DGA)

Dense Graded Aggregate functions via particle packing theory: coarse 3/4-inch angular aggregate forms an immovable structural skeleton, while medium chips and mineral stone dust fill all internal interstitial voids. Under mechanical vibratory compaction at optimum moisture (5.5%–7.5% OMC), capillary water tension lubricates particles into maximum dry density (135–138 lb/ft³), producing a pavement layer with high shear strength and low permeability.

Geotechnical Mineralogy Civil Standard Section 02

Crushed Limestone vs. Granite Crusher Run: Mineralogy & Angular Shear

Depending on regional quarry geology, crusher run is produced from either crushed limestone (calcium carbonate) or crushed granite/basalt. Crushed limestone offers superior self-cementing fines that set into a monolithic concrete-like crust over time. Crushed granite provides higher California Bearing Ratio ratings (CBR 95%–110%) and exceptional resistance to freeze-thaw degradation in northern climates.

Civil Engineering Math Civil Standard Section 03

Compaction Shrinkage vs. Quarry Order Weight

A common estimating error is assuming aggregate gains weight during compaction. In reality, mass is conserved: 18.52 cubic yards of compacted road base at 135 lb/ft³ requires exactly 35.4 tons of stone (including 5% grading buffer). Because loose stone in the truck bed occupies 20% greater volume (~112 lb/ft³), that same 35.4 tons of stone arrives as 22.9 loose cubic yards. Never multiply compacted density by the compaction factor again when ordering by scale weight.

Hydraulic Drainage Civil Standard Section 04

Transverse Crown Profiling & Water Shedding

Dense graded bases are virtually impermeable when fully compacted. Standing surface water will soften the upper crust and create potholes. Always grade an unpaved crusher run driveway with a 2% transverse crown (1/4 inch of fall per foot of half-width from center to shoulder) or a consistent 2% cross-slope to shed runoff into ditching.

Specialized Hubs