Unfortunately there would be no way for the shops to receive deliveries if the centre of town was pedestrianised. Also the buses come into the main square, which is just to the left where the blue arrow is pointing. At least the centre is mostly one-way and as the streets are narrow with sharp turns, the traffic can't go very fast, even before the 20 mph limit was introduced. In fact I can rarely drive through town at anything approaching 20 mph because I'm usually following someone driving like a snail, looking for one of the rare parking spaces.