The Federal Motor Carrier Safety Regulations (FMCSRs) address the number of hours that truckers can drive without adequate rest periods. Many long haul truck drivers are paid based upon the number of miles driven. As a result, the truck companies create financial incentive for their drivers to push the limit of safe truck operation. Many factors contribute to fatigued driving risks such as sleep apnea and shifting between day and night driving schedules. The FMCSRs regulate the number of driving hours within specific periods of time aimed to combat fatigued driving. Although many items are marketed to supposedly address driver alertness, sufficient sleep and compliance with the FMCSRs is the proper approach to safe truck operation.