Why do freeways come to a stop?

[Sabine]

I'm sure y'all know why, but now it's in picture form!

http://octanegirls.net/forums/picture.php?albumid=112&pictureid=1283

[TechGirl2020]

haha cool find! Thats neat

[Bart]

That is neat... At least I know I normally always maintain a perfect following distance and always watching wayyy ahead of me.

And they always come to a stop over here as well...

[Fox Chic]

That's funny. Highways stop around here for no good reason at all. So annoying.