(a) neglects or refuses to stop the vehicle or to make it proceed in, or keep to, a particular line of traffic whendirected so to do by the police constable in the execution of his duty, or
(b) fails to comply with the indication given by the sign,
shall be liable on summary conviction to a fine not exceeding twenty pounds, or in the case of a second or subsequent conviction to a fine not exceeding fifty pounds.
(2) A traffic sign shall not be treated for the purposes of this section as having been lawfully placed unless either
(a) the indication given by the sign is an indication of a statutory prohibition, restriction or requirement, or
(b) it is expressly provided by or under any provision of this Act that this section shall apply to the sign or to signs of a type of which the sign is one;
and where the indication mentioned in paragraph (a) of this subsection is of the general nature only of the prohibition, restriction or requirement to which the sign relates a person shall not be convicted of failure to comply with the indication unless he has failed to comply with the said prohibition, restriction or requirement.
(3) For the purposes of this section a traffic sign placed on or near a road shall be deemed to be of the prescribed size, colour and type, or of another character authorised as mentioned in subsection (1) of this section, and (subject to the last foregoing subsection) to have been lawfully so placed, unless the contrary is proved.
(4) It shall be lawful in Scotland to convict a person of a contravention of this section on the evidence of one witness.
15. Pedestrians to comply with directions to stop given by constables regulating vehicular traffic.
Where a police constable in uniform is for the time being engaged in the regulation of vehicular traffic in a road, a person on foot who proceeds across or along the carriage way in contravention of a direction to stop given by the constable, in the execution of his duty, either to persons on foot or to persons on foot and other traffic, shall be liable on summary conviction to a fine not exceeding ten pounds, or in the case of a second or subsequent conviction to a fine not exceeding twenty-five pounds.
16. Leaving vehicles in dangerous positions.
If a person in charge of a vehicle causes or permits the vehicle or a trailer drawn thereby to remain at rest on a road in such a position or in such condition or in such circumstances as to be likely to cause danger to other persons using the road, he shall be liable on summary conviction to a fine not exceeding
