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 (b) at a level crossing where a road is crossed by a railway when work in relation to that crossing is being carried out, or

(c) during the progress of temporary schemes of traffic control, if the signals are being operated and maintained by, and under the regular supervision of, the police.

(2) Such light signals shall comply with the provisions of sub-paragraphs (a), (b), (c), (e), and (g) of paragraph (2) of Regulation 31 or of the said paragraph (2) as varied by Regulation 32.

Significance of light signals

34.—(1) The significance of the light signals prescribed by Regulation 31(2) or by Regulation 33 shall be as follows:—

(a) except as provided in the next following sub-paragraph, the red signal shall convey the prohibition that vehicular traffic shall not proceed beyond the stop line on the carriageway provided in conjunction with the signals or, if that line is not for the time being visible or there is no stop line, beyond the signals;

(b) on an occasion when a vehicle is being used for fire brigade, ambulance or police purposes and the observance of the prohibition conveyed by the red signal as provided by the last preceding sub-paragraph would be likely to hinder the use of that vehicle for the purpose for which it is being used on that occasion, then the said sub-paragraph shall not apply to that vehicle; but instead the prohibition conveyed to that vehicle by the red signal shall be that that vehicle shall not proceed beyond the stop line, or as the case may be as provided by the said sub-paragraph, beyond the signals in such a manner or at such a time—

(i) as is likely to cause danger to the driver of any other vehicle proceeding on or from another road or on or from another part of the same road in accordance with the indications of the light signals operating there in association with the said red signal or as to necessitate the driver of any other such vehicle to change its speed or course in order to avoid an accident, or

(ii) in the case of any traffic which is not vehicular, as is likely to cause danger to that traffic proceeding on or from another road or on or from another part of the same road;

(c) the amber-with-red signal shall be taken to denote an impending change in the indication given by the signals from red to green but shall not alter the prohibition conveyed by the red signal;

(d) the green signal shall indicate that vehicular traffic may pass the signals and proceed straight on or to the left or to the right;

(e) the amber signal shall, when shown alone, convey the prohibition that vehicular traffic shall not proceed beyond the stop line or, if that line is not for the time being visible or there is no stop line, beyond the signals, except in the case of any vehicle which when the signal first appears is so close to the said line or signals that it cannot safely be stopped before passing the line or signals.

(2) The significance of the light signals prescribed by Regulation 31(2) as varied in accordance with the provisions of Regulation 32, shall be as follows:—

(a) subject as provided in sub-paragraph (d) of this paragraph, the red signal shall convey the prohibition that vehicular traffic shall not proceed beyond the stop line on the carriageway provided in conjunction with the signals or if the stop line is not for the time being visible, beyond the signals, except