The western crossover location for the contraflow plan for Interstate 4, viewed from eastbound I-4. The metal crash attenuator beneath the left bridge pier is the end of the permanent, concrete traffic barrier which separates eastbound and westbound I-4 traffic. Although difficult to discern, the concrete wall between the metal attenuator and the next bridge (southbound Interstate 75) is composed of modular Jersey barriers. When the contraflow plan is enacted, the Jersey barriers are quickly removed to allow some eastbound traffic to transfer to the westbound lanes. Contraflow can be enacted in the event of the need to evacuate the Tampa Bay Area if a significant hurricane threatens the region.