Driver fatigue is the leading cause of preventable semi crashes. Federal hours-of-service rules exist specifically to combat it. The 11/14-hour rule limits driving to 11 hours within a 14-hour duty period. A 10-hour off-duty break must follow. There are weekly limits (60 hours in 7 days, or 70 in 8 days, depending on schedule) and mandatory rest provisions.
Carriers and drivers cheat these rules. The pressure of tight delivery windows, dispatch incentives, and per-mile pay structures all push toward driving beyond legal limits. ELD data is the modern remedy — and modern evidence. ELDs record driving status automatically and time-stamp every movement. They can prove a driver was nine hours into a shift, or had taken no rest break, or was driving during a required off-duty period.
Federal rules require carriers to retain ELD data for at least six months. Many carriers “lose” or fail to produce data after a crash. A prompt spoliation letter and, where necessary, an emergency motion to compel preservation can prevent this.