Find out how many FODS mats and anchors you need for your construction entrance.
1. Choose Your Entrance Layout
2. Your Site Details
Each active egress point needs its own system
Your FODS Order
FODS Mats
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min. 8 | sold in 8s
Anchor Packs
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packs of 10
Entrance Length
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feet per entrance
Total Weight
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lbs total
Layout Diagram
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Buyer's Guide · Stormwater BMP & Site Exits
FODS Trackout Control Mats: The Rockless Construction Entrance
Trackout — the mud and sediment that rides off a jobsite on tires and ends up on public roads — means cleanup costs, safety complaints, and stormwater compliance risk.
FODS is a reusable, rockless construction entrance that scrubs tires clean before trucks reach the street — no rock pile to refresh, rebuild, or haul away.
84 ft²
per mat (12' × 7')
420 lb
per mat · stays put
2⅞"
staggered pyramid height
10+ yrs
service life · 3-yr warranty
How a Trackout Mat Works
Sediment drops into the low areas between pyramids — off the tires, off the road.
The mat's surface is a grid of raised, staggered pyramids. As a vehicle rolls across, the pyramids flex the tire tread and spread the lugs slightly, breaking mud and stone free from between them. That debris drops into the low channels of the mat instead of riding along to the next vehicle — so the exit keeps scrubbing all day. Mats are unidirectional: the pyramids are oriented in the direction of travel, and you build the lane so traffic crosses straight and steady.
Rockless vs. a Rock Entrance
A defined, stable exit lane that doesn't scatter or sink.
A traditional rock stabilized entrance works, but aggregate scatters, sinks into soft subgrade, and ruts under repeated traffic — so it needs constant refreshing. FODS keeps the exit geometry stable and shifts the work from rebuilding to periodic cleaning. Because it's a reusable HDPE system, you can lift it, clean it, and relocate it as access points change across the project. On one site that ran through both wet and dry stretches, a contractor reported the system cut street sweeping by roughly half.
Where It Fits in Your SWPPP
Trackout control is a Best Management Practice (BMP) — a stabilized construction exit that reduces sediment leaving the site on tires. FODS commonly serves as that rockless, reusable exit, and it works best as part of a system: pair it with inlet protection where applicable, perimeter controls, and a clear sweeping plan. If your plan requires it, log mat cleanings in your inspection records so the maintenance is documented for review.
Planning Your Layout
Mats connect in series; more length means more tire rotations.
Each mat is 12' wide and 7' long, and they connect in series in the direction of travel. The two common shapes are a single inline lane and a T-shape — the T adds a wider turning radius at the road. The longer the run, the more tire rotations before a vehicle reaches the street, which is the easiest way to improve performance on muddy or high-traffic sites. FODS mats are sold in sets of 8, and most entrances run one or more sets in series; the calculator on this page lays out a single lane, a T-shape, or a custom run and returns the exact mat count.
Install & Anchoring
A flat base plus proper anchoring keeps mats from rocking under braking.
Start with a firm, level base — compacted soil, asphalt, or concrete — and sweep loose debris first. Anchor with round-head stakes over soil, or concrete screw anchors over asphalt and concrete. A flat base and solid anchoring matter: if mats rock or lift under braking, they shift and underperform. Align the lane with traffic flow so vehicles cross straight, and stage mats near the gate to speed install (a typical entrance goes down quickly).
Keeping It Working
Clean before sediment reaches the working surface.
The mats keep scrubbing as long as the pyramids stay exposed. Clean before sediment builds up to the working surface using a broom-equipped skid steer, a street sweeper, a FODS shovel sized to fit between the pyramid tracks, or pressure washing where you can contain runoff. Schedule clean-outs after heavy rain, after muddy phases, and whenever you see visible carryout past the mat — and inspect before and after storm events as your plan requires.
Still Seeing Trackout? Go Longer
If carryout continues, the usual fixes are simple: lengthen the mat run for more tire rotations, improve base prep and compaction, and add a rinse station upstream for extreme mud. More length almost always helps before anything else does.
Quick Planning Checklist
1. Pick one primary exit and align the lane with traffic flow
2. Choose a layout: single inline lane or T-shape for a wider turning radius
3. Longer runs scrub better — size up for fine soils, wet weather, or heavy traffic
4. Prep a firm, level base and anchor to the substrate (stakes on soil, screws on hardscape)
5. Set a cleaning trigger and log it for your SWPPP inspections
The FODS Trackout Control Mat is built from durable HDPE, carries a 3-year warranty with a 10+ year service life, ships free, and is sold in sets of 8 mats.
Ready to size your entrance? Use the FODS Trackout Mat Calculator above — choose a single lane, T-shape, or custom layout and it returns the mat count for your site.
