The user operating a truck arrives at a destination and begins unloading the truck the user is outside of the truck away from the radio and is unable to hear the radio. When the user comes back to the truck later, how does the user know if he or she has missed a call? The sender who tried to contact the user can’t continue requesting calls every 2 minutes, the sender has already moved on and is busy doing other tasks. The reason behind the call made in the first place may now have been forgotten or is no longer a priority.

The same scenario could be said for;

·Delivery trucks

·Cash transit vehicles

·Taxis

·Garbage trucks

·Heavy construction machinery

·Security vehicles

·Buses

·Heavy transportation and logistic vehicles

·Traffic control vehicles

Industries where the main user operating the vehicle may need to leave the vehicle for a period of time.