Page:UK Traffic Signs Manual - Chapter 8 - Part 1 (Traffic Safety Measures and Signs for Road). Designs 2009.pdf/297

A2 APPENDIX – GLOSSARY "Incident" means an unplanned obstruction in the highway which is likely to place road users at risk. It includes, but is not limited to, road traffic accidents, broken-down or abandoned vehicles, or debris in the carriageway.

"Intergreen period" means the period between the ending of a green signal being shown to one traffic stream and the start of the green signal being shown to the other traffic stream. It is the length of the all-red period plus the amber and red/amber periods.

"Intervisibility" means the distance at the works site over which drivers have uninterrupted vision of approaching traffic in normal weather conditions.

"Junction" means the intersection of one road by another on each of which the public has a vehicular right of way. The term does not include a private driveway or works entrances and exits.

"Lighting Regulations" means the Road Vehicles Lighting Regulations 1989 (SI 1989 No 1796) as amended by the Road Vehicles Lighting (Amendment) Regulations 1994 (SI 1994 No. 2280), and the Road Traffic Regulation (NI) Order 1997.

"Local distributor road" means a road that serves communities of up to 1,000 dwellings or an industrial development. In rural areas these roads link the larger villages and HGV generators to the Primary Distributor Network. In built up areas these roads have 30mph speed limits and very high levels of pedestrian activity with some crossing facilities including zebra crossings. On street parking is generally unrestricted except for safety reasons.

"Low traffic flows" means flows less than the reduced available carriageway capacity when the works are in place. Generally low traffic flow is where the traffic flow is not more than 1200 vehicles per hour per traffic lane left open where the HGV content is less than 10%, or 1000 vehicles per hour per traffic lane left open where the HGV content is between 10% and 30%, or 900 vehicles per hour per lane left open where the HGV content is greater than 30%.

"Manual control" means control of traffic by traffic signals in which the change from one signal indication to another or to the all-red period is initiated by an operator, or by the use of "STOP/GO" boards to diagrams 7023/7024.

"Manually operated" means manual or remote control by an operative or operatives on site in view of traffic conditions.

"Manually rotated" means a sign rotated by an operative who holds the sign.

"Maximum green period" means the traffic controller setting which in the vehicle-actuated mode is the maximum period for which a traffic stream will continue to run after receiving a call from another traffic stream.

"MIDAS" (Motorway Incident Detection and Automatic Signalling) means a system used on some Highways Agency roads which monitors traffic and displays warnings to drivers about queues ahead.

"Motorway Regulations" means the Motorway Traffic (England and Wales) Regulations 1982 (SI 1982 No 1163) (as amended) or the Motorway Traffic (Scotland) Regulations 1964 (SI 1964 No 1002) as amended by the Motorway Traffic Amendment (Scotland) Regulations 1968 (SI 1968 No 960) or the Motorway Traffic Regulations (NI) 1984 (S1 984 No. 160) and subsequent amendment regulations.

"Multiphase control" means control of a junction by traffic signals with or without a shuttle lane, but with more than two separate traffic streams. 296