Question 921

A passenger car driver is traveling through a tunnel where passing is prohibited. What safe following distance must the driver maintain from the vehicle ahead?

1. 1
   At least 100 meters, or a minimum interval of 4 seconds.
2. 2
   At least 50 meters, or a minimum interval of 2 seconds.
3. 3
   At least 150 meters, or a minimum interval of 6 seconds.