The definition is as follows:turning radius (R) is defined as the track centre line radius, so the inner rail has a radius of R-0.716m and the outer rail R+0.716m (for a track gauge of 1.435m).As well as this, there is the tram ‘swept path’ in traversing a curve. This however is more complicated and depends on each tram’s geometry. The swept path depends on the width of the tram, the spacing between bogies (or wheel sets), and the over hang of the front and rear of each tram. By way of illustration I have attached a swept path for the City Class tram around a simple 15m radius curve, and another over a ‘S’ curve without a transition (straight) section. As the radius of the track curve gets smaller, the width of the swept path widens. This effects track layout in streets and the (re)location of street furniture to ensure safe operation and adequate clearances.
Bendibuses have a minimum turning radius of 22m. So if a bendibus can get around corners in Bath, a City Class benditram able to turn around 15m radius, certainly can.