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447. If your vehicle breaks down on an expressway at night, in addition to a safety tripod sign, etc. you must install road flare signals to provide visibility for ( ) and alert other motorists that your car has broken down. Choose the correct one to fill in the brackets.
- 200 meters in every direction.
- 300 meters in every direction.
- 400 meters in every direction.
- 500 meters in every direction.
Answer : 4