Walking around Lisbon one has a distinct feeling that people do not like one-way streets and the crazy traffic routing. No entry signs are constantly vandalized all over the central part of the town. Every time we took a taxi we found that it would first go in a completely crazy direction. The friendliest of drivers would drop us at some street corner and say things like "Walk down that road and take the first left." Going to the doorstep presumably was just too round about.
On the other hand, if you do not have no entry signs, you may just ride a bike up to a point of no return.