When I got my 23c shod road bike I had a few scares with bus stops and other edge markings as the narrow tyre will track along the slightest joint in the surface. I now have to be very carefull as one of the roads I sometimes use has been converted to mixed use with trams and traffic. There is a cycle path that takes a convoluted route to ensure the tracks are crossed at 90deg but as a cyclist that shuns cycle paths I find myself bunny hopping the oblique tracks to avoid possible derailments!