The primary goal of TCP design is to provide for safe movement of vehicles and other users through the construction zone as well as the protection of construction workers from those vehicles. While a certain amount of risk is inherent in any design as it is balanced against construction cost, mobility, and access, a TCP may have greater risk due to constantly changing alignments which may concern drivers who have experience navigating through that work zone, movement and operation of construction equipment and personnel, and TCP devices that need contractor maintenance.