It turns out that there are no federal safety guidelines for crashworthiness for vehicles 26,001 lbs. or heavier. With all the focus the government has on safety, particularly in regards to large truck safety, why would there be no national standard for tractor/truck cab safety?

Among the points the letter makes is that 23% of truck driver fatalities could be prevented if the cab was structurally strengthened, and 63% of truck driver fatalities are a result of a rollover. According to the letter, in the “Large Truck and Bus Crash Facts for 2008, the Federal Motor Carrier Safety Administration (FMCSA) found that approximately 700 truck drivers have lost their lives each year for the last 10 years in either single or multi-vehicle large truck crashes.” Rollover crashes accounted for 63% of all fatalities. Truck research that is worth the price tag | Trucking Straight Talk
Letter to NHTSA