[jenoer]

In the Netherlands road flares are not allowed. Only police or rescue-workers are allowed to use these in only certain situations.

Here, when accidents like these occur, our automated road information system directly displays how fast you may drive there (it has sensors to monitor traffic speed). And, within minutes, a traffic monitoring group will close down the affected roads fully and signal to which lanes people have to switch to by using arrows pointing towards the lane next to it.

The system looks like the following, and is placed on almost every highway here: https://upload.wikimedia.org/wikipedia/commons/8/88/Amsterda...