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Mud Flap Laws No. NJ Required

New Jersey Truck Mud Flap Law

New Jersey requires metal protectors or flexible flaps on the rearmost wheels of any bus, truck, full trailer or semitrailer over three tons registered weight (N.J.S.A. 39:3-79.1). The statute sets no inch figure and hands the type, design and installation to the Division of Motor Vehicles Director, tracking the old federal rule. Pole trailers, dump trucks and tanks are exempt. Roadside it's a correctable equipment ticket, judged by eye, not by tape measure.

Mud flapsRequired
Ground clearanceThe statute sets no inch number
CoverageNo width number in the statute
FineEquipment violation under Title 39; a correctable fix-it citation with a fine plus court costs

A detail here is flagged medium confidence — confirm with the state statute before you rely on it.

01 The rule

What New Jersey makes you run

New Jersey requires metal protectors or flexible flaps on the rearmost wheels of any bus, truck, full trailer or semitrailer over three tons registered weight (N.J.S.A. 39:3-79.1). The statute sets no inch figure and hands the type, design and installation to the Division of Motor Vehicles Director, tracking the old federal rule. Pole trailers, dump trucks and tanks are exempt. Roadside it's a correctable equipment ticket, judged by eye, not by tape measure.

02 The dimensions

Coverage and clearance

New Jersey Mud Flap FAQ

Are mud flaps required on trucks in New Jersey?
Yes. New Jersey requires rear mud flaps or splash guards. New Jersey requires metal protectors or flexible flaps on the rearmost wheels of any bus, truck, full trailer or semitrailer over three tons registered weight.
How low can mud flaps hang in New Jersey?
The statute sets no inch number. It delegates the type, design and installation of protectors or flaps to the Director of the Division of Motor Vehicles, whose standard is meant to conform to the old federal (ICC) requirements. No fixed clearance is written in the law itself.
What is the mud-flap fine in New Jersey?
Equipment violation under Title 39; a correctable fix-it citation with a fine plus court costs. Confirm the current amount with the MVC.

Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://codes.findlaw.com/nj/title-39-motor-vehicles-and-traffic-regulation/nj-st-sect-39-3-79-1/. See our Terms & Disclaimer.

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