The RAC and AA provide advice to motorists ahead of a red weather warning and a period of extreme heat. The RAC says breakdown callouts are expected to rise by around 20% on the day the warning takes effect compared with a typical Monday in late June. The AA advises drivers to plan for road treatment activity, saying gritters are expected to be out on roads during the period. Both organisations frame their guidance around reducing the risk of vehicle problems and maintaining safer driving conditions as temperatures rise. The articles emphasize that drivers should take heat-related precautions to avoid breakdowns, and should expect changes to road conditions and potential delays linked to monitoring and treatment by highways teams. No specific locations, temperatures, or exact timing details are provided in the shared excerpts, but the overall message is that motorists should prepare for higher demand for roadside assistance and for operational activity on roads during the warning.