V-MAC Co-Pilot Operator's Manual 57 Manual Soft Top In accordance with 2014 US Green House Gas regulations, MACK Trucks Inc. is offering optional tamper resistant Vehicle Speed Limits (VSL) with customer selectable configuration. If a vehicle is configured as a soft top vehicle, it will have an additional vehicle speed limit called Soft Top Speed Limit (STSL) which is higher than the Default Speed Limit (DSL). Normal vehicle operation accumulates a bank of time that allows you to reach STSL. This bank of time is decreased when driving at speeds above DSL. There are a number of settings defining this function and they are all visible through the cluster. These settings are connected to legal requirements to keep overall vehicle speeds down, and are defined when the vehicle is built. They are valid until the vehicle has reached its expiration mileage after which this functionality is no longer operational and the vehicle goes back to normal road speed limit settings.
The Available Time value can go negative so that ongoing soft top operation will not be aborted if time runs out. The vehicle will not be able to re-enter soft top operation until enough time has been accumulated to make the Available Time value positive again. Also, there is a maximum limit of minutes available for soft top operation for the vehicle’s lifetime. If that limit is reached, soft top operation is no longer possible.
