Also from what I understand the roads in France are not exactly like our superhighways so extracting POTUS from the roadway in case of an emergency would be difficult and that was definitely a consideration.
I’ve driven around France many times and there are some nice interstate-level roads there.
Especially in Northwestern France. Probably German-financed, so their troops could take Paris quicker...
Operational security would have been impossible. An hour there, an hour on site would have given plenty of time to place an ied on road to block passage or blow up the limo as it returned to Paris.