NHTSA seeks public comment on draft test procedure TP number TP-523-00 which is intended to assess vehicles for compliance with certain off-road capabilities requirements for vehicle classification within the Corporate Average Fuel Economy CAFE program. This TP is prepared for the limited purpose of use by contracted independent laboratories conducting tests for NHTSA. The TP presents guidelines for a uniform testing and data recording format. TPs are not rules regulations or agency interpretations. NHTSA will host a demonstration of TP-523-00 to show how NHTSA intends to test vehicles to determine compliance with its regulations on vehicle classification.