Paragraph 1 Stop signI1

every vehicle must stop before crossing the transverse line provided for at item 1 of the sign table in Part 6 of this Schedule, or if that line is not clearly visible, before entering the major road in respect of which the stop sign has been provided; and

no vehicle must cross the transverse line, or if that line is not clearly visible, enter the major road in respect of which the stop sign has been provided, so as to be likely to endanger any person, or to cause the driver of another vehicle to change its speed or course in order to avoid an accident.