What Is a Speed Trap? How to Spot and Avoid Them
General information · Updated 2026
Drivers use “speed trap” broadly, but a legal claim depends on a jurisdiction’s statute, evidence rules and traffic-engineering record. Heavy enforcement alone does not automatically invalidate a citation.
Separate the label from the law
A sudden speed-limit change or frequent enforcement may be described informally as a speed trap. Some states define the term more narrowly for evidentiary purposes. Use the exact statute rather than assuming the everyday definition is a defense.
Review official records
Posted signs, the cited speed, the enforcement method and—where relevant—the traffic or engineering survey can matter. Availability and legal significance of those records varies.
Drive to the posted rule
Crowdsourced alerts can be stale and our map does not show police activity. Treat navigation alerts as unverified and follow the posted limit and current road conditions.
Check the governing jurisdiction
Use our state summary as a starting point, then verify current rules with the issuing agency or linked statute.
View laws by state