Research on the trends in use of heavy vehicles indicate that a significant difference between the . and other countries is the relatively high prevalence of pickup trucks and SUVs in the . A 2003 study by the . Transportation Research Board found that SUVs and pickup trucks are significantly less safe than passenger cars, that imported-brand vehicles tend to be safer than American-brand vehicles, and that the size and weight of a vehicle has a significantly smaller effect on safety than the quality of the vehicle's engineering.  The level of large commercial truck traffic has substantially increased since the 1960s, while highway capacity has not kept pace with the increase in large commercial truck traffic on . highways.   However, other factors exert significant influence; Canada has lower roadway death and injury rates despite a vehicle mix comparable to that of the .  Nevertheless, the widespread use of truck-based vehicles as passenger carriers is correlated with roadway deaths and injuries not only directly by dint of vehicular safety performance per se , but also indirectly through the relatively low fuel costs that facilitate the use of such vehicles in North America; motor vehicle fatalities decline as fuel prices increase.  
There should be no mechanical default in the vehicle which is actually 5% of the accidents which take place but there should adequate measures which should be taken by individual like proper wearing of seatbelts, time to time service of the vehicle to avoid any risk during long run and other measures which should be taken by the drivers to drive safely on the highways which is the place of having maximum risk of accident. The driver which is driving a car should be well educated enough to identify the roadside signboards to minimize human error so that risk of accident from human side decreases as low it can be.