Using an intense pulse of electromagnetic energy, scientists at Nato have further developed technology that fires a beam at a moving vehicle which can interfere with the electronics on board.
The tests conducted in Norway show that the device can stop a car approaching a roadblock and could be used to thwart suicide attacks.
It can also be carried in the back of a vehicle to disable other vehicles that are in pursuit.
The researchers, who are working as part of Nato's Science and Technology Organisation, have also demonstrated it can disable jet skis and drones.
It is hoped that the device can defend against the types of attacks that were carried out against a US Navy ship in 2000, when they rammed it with boats packed with explosives.
The device has also been tested to disable electronic devices such as mobile phones that may be used to remotely trigger a bomb.
It is the latest advance in non-lethal weapons under research being carried out by military scientists around the world.
Recently US scientists unveiled a non-lethal microwave ray that induces intense pain in those in its path and was developed to help subdue riots.
Scientists from the UK, Norway, the US, Germany, France and a number of other countries have been working as part of the Nato Science and Technology Organisation to use high powered radio waves and microwaves as non-lethal weapons.
Ernst Krogager, task group chairman of the Nato STO group that has been leading this work, code-named SCI-250, described the new electromagnetic beam in a video released on the Nato website.
He said: "The ignition generates a very high intensity pulse and it will interfere with the electronic control system inside the car so the car will stop."
The video shows the system being tested in a number of scenarios to defend vehicles and checkpoints from suicide bomb attacks and approaching vehicles.
The new device has been developed in collaboration with defence company Diehl, which has also been working on high altitude electromagnetic pulse weapons.
Diehl say its "convoy protection" system, which is designed to be portable, can also be used to disable electronic sensors on improvised explosive devices (IEDs).
It states: "Enemy vehicles with electronic motor management can be stopped inconspicuously by mobile and stationary High Power Electro-Magnetics systems.
"HPEM sources can be used for personal and convoy protection, for instance, to overload and permanently destroy radio-based fusing systems.
"HPEM can also support special and police forces in fulfilling their tasks.
"HPEM systems suppress enemy communication and disturb reconnaissance and information systems, for instance, in freeing hostages."
In 2011 Diehl tested its HPEM prototypes against IEDs in an armoured vehicle in Afghanistan.
Scientists at the UK Ministry of Defence's Defence Science and Technology Laboratory have also been conducting research on directed electromagnetic energy weapons.
The most recent tests, conducted at a secret location in Norway, show how the electromagnetic beam can turn off a car engine and its lights as it approaches a checkpoint and a parked vehicle.