Safety, since you won't have to switch your glasses to read a map, read your speedometer, or read road signs while driving.
Putting the two together to create the ideal sunglasses for driving because you can see more clearly plus you can see your speedometer and map more clearly if you need one.
It would be unsafe to try to switch your eyeglasses between looking at the road, your speedometer, and the map.
A quick look revealed the speedometer was nearing the ninety mark - or did it merely look like it from her seat?
His digital speedometer read 54 miles an hour, faster than he had ever ridden in his life, and his eyes watered from the rush of cold air.
Katie Young looked at the speedometer, which read thirty-seven when the blue lights flared up behind her, jarring her out of the pre-coffee morning stupor.