Rule 302

You MUST NOT park your vehicle where it would get in the way of trams or where it would force other drivers to do so. Do not stop on any part of a tram track, except in a designated bay where this has been provided alongside and clear of the track. When doing so, ensure that all parts of your vehicle are outside the delineated tram path. Remember that a tram cannot steer round an obstruction.

Law RTRA sects 5 & 8