Rain can cause loss of traction and hydroplaning. Rain makes the road surface slippery, especially during the beginning of a rainfall. The rainwater mixes with the oil on the road to create a slippery, oily film that persists until more rain washes it away. Hydroplaning occurs when the tires lose contact with the road surface and float on a film of water, causing the driver to lose control of steering and braking. Slow down and use caution when driving on any low‑traction surface, and avoid driving altogether in extremely bad weather. You should also leave more following distance and allow at least twice the usual braking distance.