Driving In High Wind in General Discussion Posted October 4, 2013 · Report reply We are in Nevada and there are wind advisories. Some days they have red flag warnings and we know we cannot travel during a red flag warning. Other days there are wind advisories and we don't know when it is unsafe to drive our motorhome. We have a 40 foot allegro bus. Is there a rule of thumb, when the wind is above so many miles per hour, you should not go?