The Onspot system is basically a simple and very reliable concept. It is a wheel fitted with several chains that is lowered and held towards the driving wheels. When the chain wheel rotates the chains are placed under the driving wheels to increase traction.
Onspot is engaged only when needed – up to 35mph (50km/h) without having to stop the vehicle. It works whether you are accelerating, braking or in a loss of traction situation. When engaged traction is obtained in forward or reverse.
Onspot is conveniently engaged and disengaged by flipping a switch on the dashboard. It is a trouble-free and ever-present solution for avoiding delays due to slippery road conditions.
More information: http://www.onspot.com/en-US/the-product/overview/