I can confirm this. Makes the map unplayable essentially. AI also cannot use bridges and since bridges connect several main roads on the map it further impedes the map's ability to be used.
I've got this reply from NeoArmageddon on the BI forums: "it is a problem with the roads that can only be fixed when rebuilding Sahrani from source whch is most likely not happening very soon as it takes a lot of time to setup everything correctly and build it without errors.", on February 1st, 2017.
Just tested AI driving in Jeep in same road on Sahrani, no issues.
Either fixed in recent commit changes to sara wrp or recent changes to arma itself.
If you care to test, try out the next build of Dev CUP Terrains