You have two options when it comes to RiverLink transponders. One is free and for local access only. The other is an EZ pass and can be accepted in 16 states. It's a onetime fee of $15 and can be moved from car to car. If you don't have a transponder, passenger cars will be billed $4 each way, unless you start a prepaid account and register your license plate, then it will cost you $3 to cross.