What should you do after stopping on a highway due to vehicle trouble?

• Lift the hood or tie a handkerchief on the left door to signal an emergency.
  Explanation:

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  If you need to stop on the highway due to vehicle trouble, lift the hood of your vehicle or tie a handkerchief on the left door to signal an emergency.

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• Remain in your vehicle and wait for help to arrive.
• Approach nearby drivers to ask for assistance.
• Walk away from your vehicle to find help.