Passage: "Trooper Davis arrived at the collision on US-70 at 4:12 p.m. The eastbound lane was blocked by a disabled tractor-trailer. Two passenger vehicles had stopped behind it. No injuries were reported, but a fuel leak was visible beneath the truck." Which detail is true according to the passage?

1. A fuel leak was visible beneath the truck
2. Three passenger vehicles were involved
3. Two people were injured
4. The westbound lane was blocked