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Sarah says: "If there was a lone female feeling vulnerable, we could radio through to the mobile unit giving the location so they could be with her. We are monitoring the units all the time. They are in radio contact for their safety too."
Here she can see where a phone call has been made and dispatch the job to the traffic officers.
Meet Nicky and Dominic - they patrol the motorways in what looks like a police car. When they receive a call from Sarah, it's time to hit the road...