Toyota crash-avoidance system works at high speeds

Toyota PCS could prevent or mitigate up to 90% of rear-end collisions

Published: December 1, 2012, 7:00 AM
Updated: April 29, 2018, 12:25 PM

Toyota Pre-Collision System

Several automakers now offer crash-avoidance assist systems that automatically apply the brakes if a crash is imminent. Most such systems, however, are designed to be effective at relatively low closing speeds (the speed differential between the two vehicles).

But Toyota says it has developed a Pre-Collision System (PCS) with collision avoidance assist that is effective in helping mitigate even high-speed collisions.

The Toyota PCS uses millimeter-wave radar to detect the risk of a rear-end collision with a vehicle ahead. When such a risk is detected, the system warns the driver via audio and visual alerts that the brakes should be applied.

When the driver applies the brakes, PCS enables a speed reduction of up to 60 km/h by greatly increasing the braking force – up to twice that of the average force applied by drivers.


If the brakes are not applied, automatic deceleration enabling a speed reduction of 15 to approximately 30 km/h is possible. Deceleration when no brake is applied is initiated from 15 km/h.

Toyota says more than 90% of rear-end collisions occur when the difference in speed between the preceding and following vehicle is within 60 km/h – for example, when the following car is going 80 km/h and the preceding car 20 km/h – which is why it focused on a system that is effective within that real-world speed range.

Research has shown that a speed differential of 40 to 60 km/h at the time of a rear-end collision is the range in which the number of fatal and injury-causing accidents increases.

The company says its newly developed system has achieved rear-end-collision reducing-effects at the highest level in the industry.

The new PCS was developed to be used in a wide variety of models, and will be rolled out starting with soon-to-be-launched models.