When you need to set a new destination in your GPS, you can wait until you get off at the next exit, but when you've started your trip in light rain and have yo

When you need to set a new destination in your GPS, you can wait until you get off at the next exit, but when you've started your trip in light rain and have your wipers on low, when it suddenly starts raining harder, I don't see how it's reasonable to expect a driver to wait until he can stop safely before he set's the wipers on "high".