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Difference between Roadside and Vehicle-Fitted Radar for SVD

Vehicle-fitted automotive radar does not prevent collisions in all situations because it is unable to detect stopped vehicles.
Roadside mounted Stopped Vehicle Detection (SVD) radar detects any stopped vehicles and alerts all road users to the hazard using electronic LED signage.

LED road sign

Some modern cars are fitted with forward-looking radar sensors for two reasons:
At high speeds it measures the distance to the car in front on a motorway to allow adaptive cruise control to maintain the correct stopping distance.
At very low speeds the radar can avoid "rear-end" shunting accidents. A typical example is moving off from a stopped position at a roundabout and colliding with the car in front if it unexpectedly stops.

Automotive radar is clearly able to prevent some types of collision and is a useful driving aid, but it is not suitable for all situations. It cannot be used for SVD.
A well-known example of this is when a car with sophisticated sensors drove into a fire engine on a California highway [1]. The forward-looking radar was perfectly able to detect the large object but it simply ignored the fire engine because it was parked.

Automotive radar is unable to have prior knowledge of its environment because it is always on the move. Automotive radar has a reasonably wide field of view to account for road curvature and to see adjacent lanes. This means it readily detects roadside features, many of which do not move. It must ignore these stationary objects otherwise it would have numerous false detections and would try to brake every time it detected the road surface, signs, lampposts, overhead gantries or crash barriers, effectively making the system unusable and unsafe.

cars on motorway

The Ogier SVD radar system is mounted at the side of the road in a fixed position. It monitors the environment to detect if a vehicle stops on the road carriageway or hard shoulder. Existing stationary objects such as lampposts, signs and crash barriers are mapped by the radar when first configured so it can easily distinguish vehicles from the environment. Unlike automotive radar, our SVD radar is mounted high to give a good view over obstructions and eliminate blind spots.

Ogier Electronics Stopped Vehicle Detection (SVD) radar is ideally suited to detect stationary and stopped vehicles to improve road safety for all vehicles and drivers.

Vehicle-fitted radars do not compete with our roadside SVD radar as the vehicle radar actively rejects stopped vehicles, the opposite to how SVD works.

References:
[1] https://www.bbc.co.uk/news/technology-42801772

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