Road Narrows
50. We do not recommend any change in the existing “Road Narrows” sign shown in diagram 21. The recommended arrangement of reflecting lenses is shown in diagram 214.
Tram Pinch Point
51. The 1933 Committee did not consider it necessary to recommend a sign to indicate a “pinch point” where the width of carriageway between kerb and tramway lines is not sufficient to permit of the safe passage of vehicles of normal width. While these sites are not very numerous and are gradually being reduced in number, we consider that the danger to which they give rise is such as to justify the authorisation of a special sign, and we therefore recommend the introduction of the sign shown in diagram 22.
Single Track Road
52. A warning sign reading “Single Traffic Road, Passing Places Provided” has proved of much value on single track roads in the Scottish Highlands. In our view there is scope for a sign of this type in other parts of the country, and we recommend the general authorisation of that shown in diagram 23 In lieu of the existing sign.
Narrow Bridge
53. Diagram 24 shows the existing narrow bridge sign. The essential warning to be conveyed to the driver is that the carriageway becomes narrower ahead of him, and we consider that the same symbol as appears on the “Road Narrows” sign (diagram 21) is appropriate to this situation. We therefore recommend the sign shown in diagram 25 in place of that shown in diagram 24.
Single Line Traffic
54. Cases may arise where it is not immediately obvious to the drivers of approaching vehicles that the width of carriageway on or under a narrow bridge is insufficient to take more than one line of traffic. In these circumstances we recommend the special authorisation of the sign shown in diagram 26 for display under the standard “Narrow Bridge” sign.
Hump Bridge
55. The 1933 Committee considered that the sign shown in diagram 24 should also be used to indicate hump-back bridges. This was not found satisfactory in practice and a separate sign, shown in diagram 27, was later authorised. In the sign which we now recommend, shown in diagram 28, we consider that the amended symbol is more indicative of the nature of the danger to be expected than is.the existing symbol in diagram 27. The recommended arrangement of reflecting lenses in 1 the new symbol is shown in diagram 28a.
Low Bridge
56. Two low bridge signs, diagrams 29 and 30, were authorised by the 1933 Provisional Regulations. In 1939 additional signs similar to those shown in diagrams 31, 32 and 33 were authorised for general use. We consider that low bridge signs should always specify the actual headroom available over the central 10 ft. width of the carriageway and we therefore recommend that the authorisation of the signs shown in diagrams 29 and 30 should be withdrawn. We recommend the signs shown in diagrams 31, 32 and 33, which differ from the existing signs only in that the detail of the symbol has been modified and
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