Originally Posted by Wogsterca

Your right inside, doesn't make any difference though, just wonder why when the flange is 5mm wide, that they need a 40mm wide gap, seems like 10-15mm would be wide enough, and even the ultra-narrow 19mm bike tires could then simply go over it. As street cars and light rail transit vehicles get more popular in North America, it's something more and more people need to keep in mind:

When dealing with embedded tracks in a roadway, always cross rails at an angle between 45 and 135 degrees, with 90 degrees being the ideal, if this is not possible, walk across the tracks.