By law max speed is 125km/h buh 140km/h is made acceptable cuz of unknowing speed exceeding! but get caught on radar at 160km/h and for sure u'll get a SR 500/- ticket!
in city only the main roads passin throughout da city has a 120km/h max!
e.g. King Fahad Rd. in Riyadh!
FYI- now there is this new foriegn firm named "SAHAR." they are brought to install latest tech speed catchin cameras n blah blah system throughout KSA! (already earned millions in 6 months and goin pretty strict"