In transit link update process delay/ahead time is calculated. Delay/ahead time is
propagated till the end of route transit link. Vehicles average speed is taken into account to calculate the further
transit link delay/ahead time. It is assumed that the driver of vehicle will try to minimize the delay for next transit
links till end of route, so during delay calculation for next transit links a damping factor (0.85) for delay is added
to delay calculated based on average speed.