Previous poster just beat me to it! Here's a link to the RTO tests on the A340. It's got to be pretty serious to consider a stop at high speeds. The AF chap would have been convinced his aeroplane wasn't going to fly so did what he thought best in the couple of seconds available to him. As for taxying far afterwards..... well.....
YouTube - Airbus A340-600 Rejected Take-Off test (subtitles)
(sorry, don't know how to do that embedded video thing)
Bernoulli