How do weather conditions affect the recommended speed limit?

How do weather conditions affect the recommended speed limit?

Reed Berry (Driving Expert) gives expert video advice on: How do weather conditions affect the recommended speed limit? and more...

When you are driving a car you know what the speed limit is because signs are posted telling you. But does that speed apply under all conditions? No. If it is raining outside, you should slow down a little bit. If it is raining heavily, you want to slow down a little more. And if you are driving in thick fog you should slow your vehicle to an absolute crawl because in zero visibility conditions, you may not even be able to see the road in front of you let alone vehicles around you.