As a matter of fact, not only did they add street signs, but the symbol itself introduces size of the sign and orientation. I mean, who would represent a sign as a giant block with the same effectiveness from all directions? In addition, height off the ground plays an important role. With the intermediate height levels, there is a whole new section on math and blind hexes introduced. Because ASL has no real representation of what a level is, each new scenario card now has a "Level 1 is X meters" notation. With this, you can plug the elevation difference, distance to target (remember, a hex is 40 meters), and range to sign to determine if you LOS is ACTUALLY blocked by the sign. Fortunately for us, Xavier has mathematical geniuses on staff and the produced a 1000 page pamphlet were all the math is done for us and all we have to do is cross reference these values in the chart to get a true/false for LOS. It's all quite clever.
en.wikipedia.org
