Also the 20mph boroughs really confuse the systems (cars and satnav), since they very often say 30 in 20 and also 20 in a 30. The various limits are, admittedly

Also the 20mph boroughs really confuse the systems (cars and satnav), since they very often say 30 in 20 and also 20 in a 30. The various limits are, admittedly, not well signed, and I suspect that's deliberate to keep drivers cautious.