Another major advance in technology is speed detection loops which are used for operating speed cameras. Speed detection loops operate in a similar manner to the Motorway MIDAS Loop system, installed by cutting into the motorway surface, placing the loop, and then securely resealing the road surface. When a vehicle travels over two loops within the system, separated by a predefined distance, the time records are matched using number plate recognition and the speed calculated from this data. The speed is then compared with the average speed limit with that zone and sent to the enforcement agency if appropriate, accompanied by photographic evidence captured from a roadside camera.
If inductive loops are installed by sub-standard or non-accredited suppliers careless resealing can result in moisture reaching the wires and changing the electrical characteristics of the loop. This could cause a system malfunction or could mean that rogue data is transmitted to the traffic management system.
All Bridgepoint Road Markings inductive loop cutting is carried out to Highway Sector Scheme 8 regulations and to MCH 1540 Specifications as set out by the Highways Agency. In Northern Ireland we carry out road marking and traffic census term contracts for DRD Roads Service, and have a contract with Siemens Traffic Controls for the installation of inductive loops at traffic signals for the whole of Northern Ireland. In the Republic of Ireland we are a National Roads Authority (NRA) approved contractor.