Of course, this is being done by Saudi Arabia:
Makkah police have set up 69 checkpoints on various roads leading to the holy city with the aim of closing every likely entry routes used by the unlicensed and illegally arriving pilgrims.The Ministry of Haj has discovered 20 dirt roads that provide cover for the illegal and unlicensed pilgrims to sneak into Makkah unnoticed.
The Saudi Geological Survey helped the Haj Ministry and Public Security supplying them with detailed maps to locate the secret entry points and the dirt roads so that the police may set up checkpoints there as well.