Practice question
On the Pennsylvania CDL combination test, what is the purpose of mud flaps on a trailer?
- To improve fuel economy
- To reduce road spray and protect vehicles behind you from rocks and debris
- To cool the brakes
- To improve traction
Answer: B — To reduce road spray and protect vehicles behind you from rocks and debris
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Practice more: Pennsylvania CDL Combination Practice Questions - Pennsylvania CDL Combination Vehicles Test Exam →