A network system for controlling a vehicle speed includes a server, a satellite, and a control device for monitoring and modifying a speed of the vehicle. The server receives information relating to at least one travel condition, calculates a target speed based on the at least one travel condition, and transmits one or more commands indicative of the target speed. The satellite is communicatively coupled to the server and receives the command(s) indicative of the target speed. The control device includes a speed sensor generating a signal indicative of a sensed vehicle speed, a receiver communicatively coupled to the satellite and receiving the command(s) indicative of the target speed, and a controller. The controller calculates a difference between the target speed and the sensed vehicle speed, and modifies operation of a prime mover and/or traction elements to cause the sensed vehicle speed to match the target speed.