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Figure 14-17 Terminal signs at a road junction where the major road (other road) is a dual carriageway with a speed limit of 60mph and the side road is a single carriageway subject to the national speed limit of 60 mph
Although the actual speed limit is the same on both roads (i.e. 60 mph), two terminal signs to diagram 670 should be placed facing traffic leaving the side road. This is to ensure that drivers, when turning into the dual carriageway road, do not assume that the national speed limit of 70 mph applies. The repeater signs alone would not be sufficient for this purpose. Directions 7 0(5) and 7 0(6) require only one sign to diagram 677 on entering the side road
ALL-PURPOSE DUAL CARRIAGEWAY ROADS WITH A SPEED LIMIT OF 60 MPH
14.25 Where a road is part dual carriageway and part single carriageway and has a speed limit of 60 mph throughout, terminal signs must be provided at the point where the central reservation begins or ends. The speed limit on the dual carriageway will be signed as a 60 mph speed limit with terminal and repeater signs to diagram 670, varied to show "60". An order will be required to impose a 60 mph limit on the dual carriageway section. The single carriageway road will be subject to the national speed limit and should be signed as such with signs to diagram 671. Repeater signs on the single carriageway should be provided only if there is a system of street lighting (see para 14.23).
14.26 Where a two—way single carriageway road subject to the national speed limit of 60 mph has a junction with a dual carriageway road on which is imposed a speed limit of 60 mph, terminal signs to diagram 670, facing traffic approaching the dual carriageway, should be provided on each side of the road as shown in figure 14-17. In the opposite direction, only one sign, to diagram 671, is required (see directions 10(5) and 10(6)). If the side road forms a short link to another road at a grade separated junction and this other road has a speed limit other than the national limit, it might be preferable to apply this limit to the link road also, to eliminate the short length of national speed limit and hence the number of signs (see figure 14-18). This would not be appropriate, however, where the speed limit on the link road would be unrealistically low for the prevailing conditions.
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