Under what circumstance must two drivers both sign the pre-trip inspection?

The requirement for both drivers to sign the pre-trip inspection occurs when there is a discrepancy regarding defective items. This situation indicates that the drivers are not in full agreement about the condition of the vehicle, especially concerning any safety or operational defects that have been noted during the inspection. Having both signatures ensures that there is a mutual acknowledgment of the discrepancies and provides a documented record of the condition of the vehicle prior to it being driven. This practice is crucial for accountability and safety regulations within the trucking industry; it helps prevent accidents caused by mechanical failures and ensures that both drivers are aware of any issues that could affect their driving experience. Proper documentation is essential to maintain safety standards and operational integrity of the vehicle, making it vital that both drivers acknowledge the discrepancies by signing.