The tram line has been open for about two years now, but people still have trouble remembering the tram has the right of way. Maybe this will help, the audible warning doesn't seem to be enough since many people have headphones (understandable, noise cancelling is a must if the city has any car traffic).
And that line of irregular, seemingly-bumpy bricks is for accessibility for actual blind people.
In metro (subway-ish transport) stations over here, there is a line with differently textured tiles, which are also painted yellow.
They feel different to step on even when wearing shoes, so it would presumably help blind people know when they are stepping outside the walkable area.