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The Four No-Zones of a Commercial Truck
Commercial trucks have four significant blind spots — areas where the driver cannot see vehicles regardless of mirror positioning. The rear No-Zone extends approximately 200 feet behind the trailer — any vehicle following closer than 200 feet is invisible to the truck driver in all mirrors. The front No-Zone extends 20 feet ahead of the cab, making vehicles immediately in front invisible. The right-side No-Zone spans two lanes adjacent to the right side of the truck and extends from the cab back to the trailer — the largest single blind spot. The left-side No-Zone covers one lane to the left from just behind the cab to approximately one-third of the way down the trailer.
The FMCSA estimates that over 400,000 trucks are involved in blind-spot-related accidents annually. Lane change blind spot accidents are particularly common on multilane highways where trucks frequently merge between lanes without adequate mirror checks or signaling. Side-view cameras and blind-spot detection systems have become increasingly available but are not yet universally required by FMCSA regulations, though rulemaking is under consideration.
FMCSA Mirror Requirements and Lookout Obligations
FMCSA regulations under 49 CFR Part 393.80 require commercial trucks to be equipped with mirrors providing a view to the rear and both sides of the vehicle. Drivers are required under general duty of care principles to check all available mirrors before initiating a lane change and to signal lane changes in advance. Failure to check mirrors before a lane change or merging without adequate lookout constitutes negligent driving and, when combined with a No-Zone collision, creates strong liability.
Carrier liability for blind spot accidents extends beyond the individual driver's negligence. Carriers who fail to equip trucks with modern blind spot detection technology — cameras, sensors, and proximity alerts — when such technology is available and commercially reasonable may face direct negligence claims. Companies that fail to train drivers on No-Zone awareness and lane change procedures face negligent training claims. Driver qualification files that reveal a history of lane-change citations or prior blind spot accidents support negligent retention claims.
Evidence and Comparative Fault Considerations
Defense attorneys in blind spot cases often argue that the smaller vehicle should not have been in the truck's No-Zone — essentially blaming the victim for being in a space the driver couldn't see. This comparative fault argument is addressable through evidence showing the smaller vehicle was in a legal lane position before the truck initiated the lane change without adequate warning, the truck failed to use its turn signal, and the truck driver had sufficient time to check mirrors had he done so. Witness testimony, traffic camera footage, and accident reconstruction are all important in countering these defenses.
Key data
Data & Statistics
Over 400,000 trucks are involved in blind-spot related accidents annually in the United States
FMCSA No-Zone Safety Data
The right-side No-Zone of a commercial truck spans two full traffic lanes alongside and behind the cab
FMCSA Commercial Driver Training Standards
Rear No-Zone extends 200 feet behind the trailer — any vehicle in that zone is invisible to the truck driver
FMCSA Truck Safety Materials
FAQ
Frequently Asked Questions
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