When traveling below 40 MPH on a limited access highway, you should:

Sound your horn to warn others.
Drive on the shoulder.
Use your four-way flashers.
Use your high beams.
Explanation

Using your emergency (four-way) flashers when driving below 40 MPH on a limited access highway can help prevent accidents. Other drivers may not expect a slower vehicle on a high-speed road, and using the flashers can alert them to the situation.

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