Going South out of Las Vegas on the I15 the grooves in the cement are so big the cars swerve all over the place, very hard to keep the car straight in some sections.
Many freeways are made of cement sections originally 12 feet long, but they found out repetitive noise from going over the joints was putting people to sleep, they now very the length between 12 and 17 feet.
There is a four way intersection between highway 58 and 395, both roads are asphalt and traveled by a lot of semi trucks. As you get to the intersection the semi trucks brake hard and press into the road. The tire cause channels in the road about four inches deep and on either side the asphalt is pushed up a few more inches. You must pay attention or you might bottom out.
