A 3-minute lesson from the Alaska course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.
A few more rules cover how your vehicle affects others: horn use, noisy exhaust, unsecured loads and litter. Carbon monoxide from your own exhaust is a silent danger to you.
Know the rule
Don't use your horn unless it's necessary for safe operation.
Every motor vehicle must have a muffler in good working order and in constant operation. No muffler cutout, bypass or similar device may be used on a highway.
It's -20 degrees and you want to warm the car before work. Never let it run inside a closed garage. Carbon monoxide is colorless and odorless and can overcome you before you notice anything.
Check your understanding
Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.
What is prohibited regarding a vehicle's exhaust system?
Using a muffler cutout, bypass, or similar device
Replacing a worn muffler with a new one
Installing an aftermarket muffler
Servicing the exhaust system annually
Answer: Using a muffler cutout, bypass, or similar device
No person may use a muffler cutout, bypass, or similar device on a highway vehicle.