Simple solution - yellow and black diversion signs leading to a network of single track roads.
I am sure there are some locally which the locals would happily sacrifice for a day or two. After an hour or two sitting in an overheated car not going anywhere very much, they may decide to go home.
Alternative strategy - police use ANPR and cammeras to pursue ALL cars passing with no tax, no insurance, no MoT, speeding. Should put off a few tourists!
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