UPDATE: Originally published 12/15/2011
Nothing about this idea sounds good. Mechanix discusses the attempts to use rockets for braking in their June 1946 edition of the magazine. One of the vehicles tested was a military jeep, with a special pyramid behind the driver to protect in case of a roll. It almost looks like the driver has a seat belt.
http://blog.modernmechanix.com/2006/11/14/rocket-brakes-for-emergency-stops
nope.
don’t think so….