A method for controlling vehicle progression along a ride path of an amusement park ride. The method includes receiving inputs from a passenger of a vehicle on the ride path and processing the received inputs to determine a vehicle state change. The method includes determining a present or predicted vehicle state and comparing the present or predicted vehicle state with constraints defined by a dynamic boundary associated with the vehicle. The method includes issuing vehicle control commands to a drive assembly to implement the vehicle state change if it complies with the constraints. The dynamic boundary is moved logically along the ride path at a nominal to define a set of boundaries for movement of the vehicle along the ride path. The vehicle state change may be a change that causes the vehicle to travel at a speed differing from the dynamic boundary while remaining within the dynamic boundary.