Signals, Signs and Pavement Markings · Warning Signs
BUMP
The traffic sign warns you that there is a bump up ahead on the road. Reduce speed and make sure to have both hands on the steering wheel as you approach the bump to avoid losing control of the vehicle. You should react in the same way when you see a DIP sign.
Learn it with your state's rules
DMV One Way teaches the whole handbook slide by slide and checks it with practice questions.