What 392.2-CONSZ means in plain language
FMCSR 392.2-CONSZ addresses exceeding the posted speed limit in a designated construction or work zone. When you're driving a commercial motor vehicle through an active construction area, the speed limits posted there are enforceable under federal safety rules. These zones are marked with signs and temporary speed reductions to protect workers and other road users.
Construction zones present unique hazards: reduced lanes, equipment in motion, workers near the roadway, and unpredictable traffic patterns. The regulation requires you to observe whatever speed limit is posted in those zones. If the sign says 35 mph and you're doing 40 mph, you're in violation—regardless of the speed limit on the main highway.
This is distinct from general speeding violations. Construction zones have a specific regulatory basis because of the heightened danger they present. Your obligation as a commercial driver is to treat posted construction zone limits as mandatory, not advisory.
What our enforcement data actually shows
Our inspection records show that 392.2-CONSZ has zero citations in our database as of April 2026. Across our 13 million+ roadside inspection records, there are no documented instances of this code being cited in the last 90 days, last 12 months, or all-time. The out-of-service rate is therefore 0.0%, with zero instances of placement out of service and zero instances of non-placement.
This absence of citations does not mean the violation is rare or that enforcement does not occur. Rather, it may indicate that inspectors use related speeding codes more frequently in the field, or that this specific construction-zone designation is cited under different code variants. The zero-citation pattern suggests this particular code variant is either narrowly applied or recorded differently in roadside inspection systems.
Despite the zero count, this code remains out-of-service eligible, meaning an officer can place your vehicle out of service if the violation is documented. The CSA severity weight of 7 places it in the moderate range for unsafe driving infractions.
Who gets cited most
Given that our database shows zero citations for 392.2-CONSZ across all time periods, we cannot identify state distribution or carrier patterns for this specific code. No state or carrier data is available from our enforcement records.
If you are cited for this violation, the enforcement will be recorded at the state and carrier level where the infraction occurred, but our current dataset does not reflect historical citations for this code. This makes it difficult to predict where enforcement is most active or which carrier types are most commonly cited.
How severe is this compared to similar codes
To understand the severity context, we can compare 392.2-CONSZ to related unsafe driving codes in our database. Code 392.2, Operating a CMV while ill or fatigued, shows 1,208,164 citations all-time with a 0.8% out-of-service rate. Code 392.2-SLLS2, Speeding 6–10 mph over limit, has 72,337 citations all-time and a 0.0% out-of-service rate.
Both of these peer codes show substantial enforcement volume compared to the zero citations for 392.2-CONSZ. The out-of-service rates for similar speeding infractions cluster around 0.0% to 0.2%, suggesting that speeding violations, even when cited, rarely result in immediate vehicle removal from service. However, the CSA severity weight of 7 on 392.2-CONSZ indicates federal regulators view construction zone speeding as a serious safety concern, comparable in weight to other unsafe driving patterns.
How to avoid it
-
Scan ahead for construction signage. Construction zones are posted well in advance. Reduce your speed proactively when you see yellow work-zone signs, before you enter the posted area. Do not wait until you pass the speed-limit sign itself.
-
Understand that posted limits are hard limits in work zones. Unlike some highways where enforcement tolerance exists, construction zone speed limits are strictly posted for worker protection. Treat them as absolute.
-
Plan your route timing. If possible, avoid driving through major construction zones during peak hours when traffic is heaviest and enforcement is often most visible. Check DOT construction alerts before starting your trip.
-
Adjust your following distance and braking margin. Construction zones often have lane reductions and unexpected stopped traffic. Even if you observe the speed limit, you need extra space to stop safely. This reduces the temptation to speed through congestion.
-
Verify your speed regularly. In congested construction zones, speeds can drift upward when you're managing lane changes and traffic. Check your speedometer frequently and reset your mental baseline to the posted limit, not to the speed of surrounding traffic.