ISTEA created a new block grant program, the Surface Transportation Program (STP), which made funds available for a broad range of highway, mass transit, safety and environmental purposes. STP funds could be used for highway construction and 4R; bridge projects; transit capital projects; carpool, parking, bicycle and pedestrian facilities; highway and transit safety improvements; traffic monitoring, management and control facilities; transportation control measures; and wetland mitigation efforts.
A transportation funding program within TEA-21. STP funds may be used for roadway construction and improvements, operational improvement, transportation systems, bicycle and pedestrian facilities, transit, ridesharing programs and facilities and transportation planning and studies.