A system for reducing traffic accidents caused by distraction from a mobile telecom device. The system detects when the device is near a driver's seat of a moving vehicle. While the system is carrying a voice call between a remote voice device and the mobile device, the system modifies voice signal transmission between the devices by periodically playing a beep or other signal to remind the parties that one of them is driving and suspends voice signal transmission from the remote device to the mobile device when the system detects that circumstances affecting level of attention required for driving merit the driver paying greater attention.