Chen Yang quickly surveyed the area ahead. The car was in the middle lane, and there were no other vehicles approaching. Ignoring the danger, he climbed over the guardrail, waved rapidly towards the car in the middle lane, and shouted:
"Slow down! There's an accident in the tunnel ahead!"
The car driver was quite alert and braked in time. Chen Yang jogged to catch up with the car and guided it to stop in the emergency lane. After hearing Chen Yang's explanation of the situation, the car driver broke out in a cold sweat. Chen Yang and the driver then took the warning triangle from the car and walked a full 150 meters in the direction of oncoming traffic.
Ahead was a long slope, so speeds were generally not high, and visibility was good. Chen Yang placed the warning triangle in the fast l
