The only place where I've heard of DCS cases related to driving after diving is in the Aqaba-Amman road, Jordan.
In Israel there is the Eilat-Mitzpe Ramon road which gets up to about 800 meters and is about 2 hours from Eilat. Never heard of a case of DCS symptoms related to this altitude- Myself, I drive it all the time after diving in Eilat.
In Sinai the road is even lower- even at the "high" passes near Nuweiba/Dahab road, which is also a few hours from Sharm. I wouldn't worry about it (and yes, I know of dozens of divers who drove this road more than once after safaris, including me ).
Thanks, but I was being "better safe than sorry". As we drove into Sharm, we kept going up and up and up and my ears were popping away. I didn't have any idea what altitude we were at, but it seemed higher than I wanted to risk it. (Maybe I'm just a little too conservative, Oh well )
We deided it would be much better to give up a night dive and then an early morning dive before getting on the road. It also gave us a great chance to clean and dry our gear while all the other divers were in the water. So, when we reached the dock it was a quick jump off the boat while everyone else was scrambling to get packed up.