Reserved powers are those powers reserved for not reserved for- but  granted to the states. The definition of reserved powers: All  powers not expressed in the Constitution â¦are granted to the states  and called reserved powers.
While the vast majority of Interstate highways have no tolls, approximately 2,900 miles of Interstates are tolled in 21 states. These tolled facilities range in length from 500-mile New York State Thruway to tolled sections of I-95 in Delaware and Maryland.
This network was designed to exacting federal standards in order to receive federal funding. The system, as of 2004, has a total length of 46,837 miles (75,376 km),making it both the largest controlled-access highway system in the world and the largest public works project in US history.