Please note that hazardous road conditions can change scheduling, so check in advance. (visitcalifornia.com)
If possible, do a «practice run» beforehand, if this is not possible allow yourself enough time to get there ahead of schedule and check in advance for any possible delays. (dhl-graduates.com)
The only exception would be if you're renting a specialty car — in that case, check in advance with your insurance company to make sure you're covered. (progressive.com)