Commercial truck crashes often involve more parties and more evidence. The driver, the trucking company, the cargo loader, a maintenance contractor, or a parts manufacturer may share responsibility. Interstate carriers are subject to federal safety rules (FMCSA) on hours of service, driver qualifications, drug testing, and vehicle maintenance. Violations can be strong evidence of negligence. Trucks also carry electronic logging devices and “black box” data that can be overwritten. A lawyer can send a preservation (spoliation) letter quickly so that data, dashcam footage, and driver logs are not lost. Federal minimum insurance for many carriers is far higher than for passenger cars.