AAATHE Law RVLR regs 25 & 27  6.Hot weather  237. Keep your vehicle well ventilated to avoid drowsiness. Be aware  that the road surface may become soft or if it rains after a dry spell  it may become slippery. These conditions could affect your steering  and braking. If you are dazzled by bright sunlight, slow down and if necessary, stop.  highwaycodeuk.co.uk 123 