A barrier configured to be located at a door a vehicle having a lift platform to enable an individual using a mobility device to exit and to enter an interior of the vehicle. The barrier includes a support base configured to be fixedly coupled to the vehicle. A first side and a second side each extend from the support base are spaced apart to define an access location for the individual using the mobility device. A barrier gate or a barrier plate include an entry position and a blocking position wherein, in at least one embodiment, movement of the lift platform moves the barrier plate from the entry position to the blocking position.