Motorways
Many other Rules apply to motorway driving, either wholly or in part: Rules 46, 57, 83-126, 130-134, 139, 144, 146-151, 160, 161, 219, 221-222, 225, 226-237, 274-278, 280, and 281-290.
General
Motorway signals
258
Red flashing lights. If red lights on the overhead signals flash above your lane and a red 'X' is showing, you MUST NOT go beyond the signal in that lane. If red lights flash on, a signal in the central reservation or at the side of the road, you MUST NOT go beyond the signal in any lane.
Laws RTA 1988 sect 36 & TSRGD regs 10 & 38