Ten new signs are being put up near bridges on the A12 following a number of incidents where objects have been dropped onto vehicles.
The black and yellow notices give drivers information on what to do in the event of any emergencies and will be set up between Mountnessing and Boreham.
Each sign gives a number for the bridge to help emergency services to identify the precise location and reach the scene as quickly as possible. It also tells callers to dial 999 if they see anything suspicious or need urgent assistance.
The signs were suggested by officers from Essex Police's Casualty Reduction Unit to ensure that non-local users of the A12 gave clear and precise information about the location of any incidents.
Chief Inspector Richard Phillibrown, head of special operations for Essex Police, said: "It is important that we receive information quickly and precisely in any incident. But as the A12 is a major trunk route and is used by hundreds of thousands of people from outside Essex many people could be confused about their location on the road.
"We are grateful to the Highways Agency for providing these notices which will help us get our officers and other emergency services to the scene as quickly as possible."
Essex detectives are still investigating the two incidents that occurred on the evening of December 1 last year, in which a block of concrete and a large stone were dropped on to cars on the A12. Anyone with information about those incidents at Ingatestone and near Galleywood, should contact Essex Police on 101 or call Crimestoppers anonymously on 0800 555 111.
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