| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | BRITISH STANDARD <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | Committees responsible for this British Standard <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | 1 Scope 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions access zone access zone length access zone luminance carriageway contrast revealing coefficient <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | counterbeam lighting daylight screen design speed emergency lane entrance portal entrance zone exit portal exit zone interior zone interior zone luminance look-through percentage mixed traffic overall uniformity <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | parting zone speed limit stopping distance symmetrical lighting threshold zone threshold zone lighting threshold zone luminance threshold zone luminance ratio traffic flow traffic lane transition zone transition zone luminance visual guidance <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 3.2 Symbols 4 Tunnel conditions 4.1 General <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 4.2 Daytime conditions 4.3 Night-time conditions 4.4 Lighting for different tunnel lengths <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 5 Tunnel lighting design 5.1 Determination of stopping distance Stopping distances for various design speeds 5.2 Tunnel lighting classification Traffic flow Tunnel lighting class selection <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4.2 Daytime conditions 4.3 Night-time conditions 4.4 Lighting for different tunnel lengths <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 5 Tunnel lighting design 5.1 Determination of stopping distance Stopping distances for various design speeds 5.2 Tunnel lighting classification Traffic flow Tunnel lighting class selection <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 5.3 Determination of access zone luminance 5.4 Determination of tunnel zone daytime lighting levels Values of <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Luminance reduction curve <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Road surface luminance of the interior zone 5.5 Luminance and uniformity values Uniformity of the road surface luminance <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.6 Tunnel walls 5.7 Determination of night-time lighting levels 5.8 Flicker <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.9 Glare 5.10 Lighting controls 5.11 Mains failure lighting 5.12 Traffic signals <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 6 Calculation and measurement 6.1 Calculation 6.2 Measurement <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 4.2 Daytime conditions 4.3 Night-time conditions 4.4 Lighting for different tunnel lengths <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5 Tunnel lighting design 5.1 Determination of stopping distance Stopping distances for various design speeds 5.2 Tunnel lighting classification Traffic flow Tunnel lighting class selection <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | (informative) Tunnel design, use and operational aspects that affect tunnel lighting design (informative) Tunnel design, use and operational aspects that affect tunnel lighting design Driver comfort Tunnel design Tunnel maintenance <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | (informative) Lighting systems (informative) Lighting systems General Symmetrical lighting systems Counterbeam lighting systems Symmetrical lighting system <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Counterbeam lighting system (normative) Daytime lighting of short tunnels (normative) Daytime lighting of short tunnels C.1 Determination of look-through percentage <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Look-through percentage Visual angles <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Determination of need for daytime lighting General Daytime lighting for LTP values between 20 % and 80 % Transverse position of object and observer <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Visibility of a car Visibility of a pedestrian\/bicyclist <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | (normative) Determination of access zone luminance by direct measurement (normative) Determination of access zone luminance by direct measurement Apparatus Luminance meter, preferably accepting a 20\u00ba circular field of view (see Note), mounted on a tripod. Procedure for existing tunnels The luminance meter and tripod (D.1.1) should be placed in the centre of the carriageway approaching the tunnel at a height of 1.5 m above the road surface and aimed… Measurements should be taken on several days when the sun is shining. Conditions with white clouds in the sky, particularly in the field of measurement, should be included as they can produce a higher value of L20. Any situation where the sun enters the A series of measurements should be taken at both ends of the tunnel around the times when the maximum L20 values are reached, and should be plotted against time. Procedure for planned tunnels Where a tunnel is yet to be constructed, L20 measurements should be made from positions corresponding to where the new road will be. The luminance meter should be aimed at the point to be occupied by the tunnel entrance. Measurements should be taken as detailed in D.2.2. <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | (normative) Determination of access zone luminance by the grid method (normative) Determination of access zone luminance by the grid method <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Perspective view of a tunnel entrance with superimposed 20\u00ba subtense circle 20\u00ba field of view divided into assessment areas <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Typical luminance values Example of determination of access zone luminance, L20 (informative) Estimation of the access zone luminance (informative) Estimation of the access zone luminance <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Examples of tunnel approaches giving access zone luminances to be used <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 5 Tunnel lighting design 5.1 Determination of stopping distance Stopping distances for various design speeds 5.2 Tunnel lighting classification Traffic flow Tunnel lighting class selection <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Code of practice for the design of road lighting – Lighting of tunnels<\/b><\/p>\n |