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If you see a sign on the rear of a vehicle consisting of an orange triangle with a red border, this indicates that the vehicle will be traveling at which speed?

  1. 60 km/h or more

  2. 50 km/h

  3. 40 km/h or less

  4. 30 km/h

The correct answer is: 40 km/h or less

This sign is commonly known as the "slow-moving vehicle" sign, and it is used to warn other drivers that the vehicle will be traveling at a speed of 40 km/h or less. Option A is incorrect because 60 km/h is too fast for the vehicle in question. Option B is incorrect because it is the standard speed limit in most countries, so a specific sign for it is unnecessary. Option D is incorrect because it is too slow for most vehicles on the road, especially on highways. In comparison, 40 km/h is considered a slow speed for a vehicle on the road and requires additional warning for other drivers. Therefore, the correct answer is C.