LONGITUDINAL LINES CENTRE LINES4.1

LONGITUDINAL LINES
CENTRE LINES4.1 The 1994 Regulations introduced new markingsintended for use as centre lines separating opposingflows of traffic on single carriageway roads. These areillustrated in figure4-1 and the dimensions andrecommended applications are shown in table 4-1.Diagram 1008 is used where the speed limit is40mph or less, and 1008.1 where the speed limit ismore than 40 mph.4.2 All new installations and reinstatements mustuse diagrams 1008 and 1008.1 for centre linemarkings (where warning lines and double linesystems are not appropriate) in place of old markingsto diagram 1005.4.3 The marking should be used only on singlecarriageway roads. Where the road comprises onelane in each direction, the 100 mm wide marking willnormally be sufficient. On four-lane roads, three-lanemarked as two in one direction and one in the other,or two-lane 10m wide, the 150 mm marking shouldbe used. Any lane lines should be 100 mm wide (seeparas 4.7 to 4.11). The centre line should never benarrower than the lane line (see para 4.10). It may be replaced by the warning line (see paras 4.12 to 4.26)where appropriate. When there are two or morelanes in each direction, consideration might be givento double white lines (see section 5).4.4 Where forward visibility is restricted (seepara4.16) or on the approach to some other hazard(e.g. a roundabout or other junction), the centre linemarking should be replaced with warning lines todiagrams 1004 or 1004.1 (see figure 4-3). These arethe inverse of the mark / gap dimensions for thecentre line and therefore maintain the same module(see table 4-3 for the minimum number of marks).4.5 On two or four lane roads the marking shouldnormally be laid in the geometric centre. It canhowever be laid off-centre to allow parking alongone side. Where it is necessary to change the positionof lines in relation to the centre of the road, thedeflection should be smooth and made at theinclinations specified in table 14-1.4.6 On rural roads below 5.5 m in width, over-running of the carriageway edge can occur if centreline markings are provided, causing maintenanceproblems. Drivers might also expect a road markedwith a centre line to be wide enough for opposinglanes of traffic to pass. In these circumstances thecentre line should be omitted, but it would be helpfulif edge of carriageway markings are then used.LANE LINES4.7 Lane lines (see figure 4-2) ensure that availablecarriageway space is used to its maximum capacity. Inhelping vehicles to maintain a consistent lateralposition, they also offer safety benefits and should beused wherever practicable.4.8 The marking is intended for dividing thecarriageway into lanes where traffic on either side ofthe line travels in the same direction, and not forseparating opposing flows of traffic. Details are setout in table 4-2.4.9 Lane lines on the approach to Give Way andStop markings, including roundabouts and trafficsignals, should change to warning lines in accordancewith table 4-3 and para 4.24.

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GARIS-GARIS LONGITUDINAL CENTRE LINES4.1 The 1994 Regulations introduced new markingsintended for use as centre lines separating opposingflows of traffic on single carriageway roads. These areillustrated in figure4-1 and the dimensions andrecommended applications are shown in table 4-1.Diagram 1008 is used where the speed limit is40mph or less, and 1008.1 where the speed limit ismore than 40 mph.4.2 All new installations and reinstatements mustuse diagrams 1008 and 1008.1 for centre linemarkings (where warning lines and double linesystems are not appropriate) in place of old markingsto diagram 1005.4.3 The marking should be used only on singlecarriageway roads. Where the road comprises onelane in each direction, the 100 mm wide marking willnormally be sufficient. On four-lane roads, three-lanemarked as two in one direction and one in the other,or two-lane 10m wide, the 150 mm marking shouldbe used. Any lane lines should be 100 mm wide (seeparas 4.7 to 4.11). The centre line should never benarrower than the lane line (see para 4.10). It may be replaced by the warning line (see paras 4.12 to 4.26)where appropriate. When there are two or morelanes in each direction, consideration might be givento double white lines (see section 5).4.4 Where forward visibility is restricted (seepara4.16) or on the approach to some other hazard(e.g. a roundabout or other junction), the centre linemarking should be replaced with warning lines todiagrams 1004 or 1004.1 (see figure 4-3). These arethe inverse of the mark / gap dimensions for thecentre line and therefore maintain the same module(see table 4-3 for the minimum number of marks).4.5 On two or four lane roads the marking shouldnormally be laid in the geometric centre. It canhowever be laid off-centre to allow parking alongone side. Where it is necessary to change the positionof lines in relation to the centre of the road, thedeflection should be smooth and made at theinclinations specified in table 14-1.4.6 On rural roads below 5.5 m in width, over-running of the carriageway edge can occur if centreline markings are provided, causing maintenanceproblems. Drivers might also expect a road markedwith a centre line to be wide enough for opposinglanes of traffic to pass. In these circumstances thecentre line should be omitted, but it would be helpfulif edge of carriageway markings are then used.LANE LINES4.7 Lane lines (see figure 4-2) ensure that availablecarriageway space is used to its maximum capacity. Inhelping vehicles to maintain a consistent lateralposition, they also offer safety benefits and should beused wherever practicable.4.8 The marking is intended for dividing thecarriageway into lanes where traffic on either side ofthe line travels in the same direction, and not forseparating opposing flows of traffic. Details are setout in table 4-2.4.9 Lane lines on the approach to Give Way andStop markings, including roundabouts and trafficsignals, should change to warning lines in accordancewith table 4-3 and para 4.24.