I get the letter-writer's argument. But there are two problems with her logic: first, there are going to be major problems for years because the Valley Line is so different from the LRT we've had all this time. The LRT system we've had since 1978 has never crossed roadways without crossing gates and bells. Drivers are not used to interacting with a system that lacks these safeguards. And the fact that we will now have two LRT systems operating simultaneously very differently and interacting with vehicular traffic in disparate ways is going to lead to continued problems.
It's also worth noting that there are plenty of other rail crossings in the city--CN and CP--where trains cross motorists' paths. The vast majority of them have crossing gates and bells. Again, that's how drivers are used to interacting with trains.
The other issue is one of design. Not only does the Valley Line cross major roadways but it does so in very odd ways in a lot of places. It cuts across multiple lanes of traffic on 28 Avenue at a sharp angle. It not only crosses busy 82 Avenue at-grade (we're going to regret that) but also changes sides of the street from the middle to the west side. On the Valley Line West we're going to see similar issues on Stony Plain Road through Glenora, where the line switches sides and crosses traffic lanes at an angle.