It is my understanding that you need to narrowly miss an A.I. car that has crashed in front of you to get a crash escape.
There is already a thread about this from yesterday :D
I come across it when i was looking for the same answer > so I did a little practice and to me easiest way to get this achievement is if you just drive after 1 or 2 AI drivers and wait they make mistake and crash into each other or traffic , then all you have to do is zoom by without crashing them > hence , crash escape. It happens randomly and not in every race so be patient .
sometimes helps if you follow them after race is over and AI racers will go on free roam > do the same routine , follow them ,you can do some bumper action , but do not crash them totaly and eventually they will crash into someone and you'll zoom by :D
You dont need to narrowly pass them. It's quite generous with the space you can have. It's the same thing as "get x near misses". As long as you're driving either against or with the traffic you get a near miss as long as you're still on the road. But yeah, that tip above is the best one I can think of too.