§ Mrs. Dunwoodyasked the Secretary of State for Transport at what intervals it is his Department's policy to place speed warning signs on motorways where such signs are used.
§ Mr. RidleyFlashing amber lights operated at the roadside by the police are provided at 3-km intervals for the opening of individual sections of new motorway. They are superseded at the same locations by remotely controlled matrix signals in the central reservation. Where there is a need to display different restrictions over individual lanes, such as on the approaches to motorway/motorway interchanges, on an elevated motorway, or on the approaches to motorway tunnels, the matrix signals are mounted at closer intervals on gantries.
§ Mrs. Dunwoodyasked the Secretary of State for Transport what is the cost of (a) a flashing motorway speed 132W warning sign, (b) a motorway digital speed warning sign sited in the central reservation and (c) an overhead motorway speed warning system.
§ Mr. RidleyTypical costs are as follows:
- (a) £600 for each sign;
- (b) £46,000 for back-to-back post mounted signals at a nominal 3-km spacing;
- (c) £231,000 per carriageway for a system of three gantries, which is usually the minimum required for an overhead system.