If the time headway is larger than a pre-determined threshold 
, the vehicle does not interact with the leading
vehicle. In this case, if the vehicle's current speed is lower than
its target speed, it
accelerates at the maximum acceleration
rate to achieve its target speed as quickly as possible; if
the current speed is higher than the target speed, the vehicle
decelerates with the normal deceleration
rate to slow down:
where:
