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FMCSA Following Distance Requirements
FMCSA regulations under 49 CFR Part 392.21 require commercial drivers to maintain sufficient following distance to stop safely given the driver's speed and braking capability. The regulation references the standard that for every 10 mph of speed, a commercial truck driver should maintain at least one second of following distance — but given the actual stopping distances involved, FMCSA guidance recommends one second per 10 feet of vehicle length per 10 mph of speed for trucks operating over 40 mph. For an 80-foot tractor-trailer at 65 mph, this translates to approximately 5-6 seconds of following distance — roughly 400-500 feet.
Violation of following distance requirements is documented through EDR data — the truck's black box records whether the driver applied brakes and the pre-impact speed, which allows accident reconstruction experts to calculate whether the following distance was adequate given reaction time and braking capability. GPS data showing the truck's position relative to the vehicle ahead (from forward collision warning system logs) can directly quantify the following distance violation.
Stopping Distances and Physics of Rear-End Crashes
The physics of truck stopping distances are stark and directly relevant to establishing negligence. A fully loaded 18-wheeler traveling at 65 mph requires approximately 525 feet to stop under ideal conditions — a distance equivalent to nearly 1.5 football fields. This includes perception-reaction time (approximately 150 feet at 65 mph for a 1.5-second reaction) plus braking distance (approximately 375 feet with well-maintained brakes on dry pavement). Wet, icy, or graded pavement increases stopping distance substantially. Underadjusted brakes can double stopping distance.
Rear-end truck crashes frequently involve the underride hazard described in separate coverage — if the truck's speed is sufficient and the height differential allows, the front of the struck vehicle can slide under the truck's front bumper height on impact. Forward-facing ADAS (advanced driver assistance systems) — automatic emergency braking (AEB) — can prevent many rear-end crashes and is increasingly standard on new trucks. A carrier that disabled its AEB system, or operated trucks without available AEB technology, faces direct negligence arguments based on failure to use available safety technology.
Key data
Data & Statistics
A fully loaded 18-wheeler requires approximately 525 feet to stop from 65 mph — nearly double the stopping distance of a passenger car
FMCSA Stopping Distance Data
Following too closely is cited as a driver-related factor in approximately 18% of rear-end truck crash investigations
FMCSA Large Truck Crash Causation Study
Automatic Emergency Braking (AEB) reduces rear-end truck crashes by an estimated 44% in NHTSA effectiveness studies
NHTSA AEB Effectiveness Research 2024
FAQ
Frequently Asked Questions
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