You are driving along a highway with a speed limit of 65 mph. It starts to rain heavily. At what speed should you drive?

Speed limits are posted for ideal conditions. However, you are required to always drive at a speed that is safe and reasonable for current road conditions. You may be cited for driving too fast for current road conditions. At speeds over 35 mph, your vehicle can start to hydroplane in standing water. Therefore, you should slow down in heavy rain. [Speed Limit Signs, Regulatory Signs, Section 6: Rules of the Road, Kansas Driving Handbook; Adjusting to Roadway Conditions, Speed Management, Section 7: Safe Driving Tips, Kansas Driving Handbook]