Finally, if a vehicle has a headway between 
and 
, it is in the car-following regime. In this case
the acceleration rate is calculated based on Herman's general
car-following model [Herman et
al.(1959)]:
where 
, 
and 
are model parameters.
, 
, 
are used for accelerating (
), and 
, 
, 
for decelerating (
) cases. Default values for these parameters are
based on [Subramanian(1996)] and listed
in Table C.8.
