There are many things to consider speed of movement is just one of them. The environment the vehicle is ie is it on a busy road where immobilizing the unit even at low speed could result in an accident. When the engine is stopped all power assistance for steering and breaking is also lost. Normally the immobilization occurs when the vehicle is turned off and it cannot be restarted. In some countries it is illegal to immobilize the engine directly.
Alternative is to restrict the fuel so that the vehicle has to pull over and then it could be immobilized.
Phoenix Solusi
Mobile Visible Secure
Specialists in data acquisition and analysis for mobile and fixed assets. Integration in to content management systems is a specialty we have.