@farnhamherald I'm sorry but wom ever is in charge of roads and signage have demonstrated on to many occasions that common sense is not high on the list for the job requirements
@farnhamherald As a master tech I can tell you a modern car with them bigger gearing will not drive efficiently at 20mph as it in-between optimal gear range causing the engine to generally be revving higher to not stall and be reasonably trackable , this is caused by lack of torque from eng