So I was driving down a busy highway recently and I saw an interesting scene. I want to know the story behind it, so obviously the solution is to write it myself/get someone else to write it. I want to know what people can come up with, so here it is as a writing prompt. Have at 'er!

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It is evening, about 7:00. It's summer, so it is still light out. The highway is lined with cement barricades, as there is quite a drop off into the ditch. In a turnoff point on the side of the busy highway are four police vehicles, lights on. They are all pulled up behind a single civilian vehicle: a hatchback with the doors and trunk open. There is a gas can in the trunk and nothing else. No civilians are in sight, but there are five police officers. One of them is taking pictures of the ditch or the forest beside the road, the other four are standing next to the civilian car in a circle, talking. There is a pair of crutches leaning up against a cement barricade between a police vehicle and the civilian vehicle.