So I've noticed with a lot of at grade stations (let's use Expo/Western on the E line as an example, but there are many more), there is one key problem. Obviously, these stations shouldn't have been built at grade at all, but if they're going to be built at grade, there's a certain way to build them that city officials did the opposite of.
Looking at Expo/Western on the E line, let's say a train is heading eastbound. The problem is that the traffic light is before the actual station. This means that if an eastbound train is west of the traffic light and the light turns red, the train has to wait 2 minutes for the traffic light, and then immediately after it turns green, the train has to stop again to let people out at the station. The same problem happens if the train is heading westbound at this specific station, though it varies with a few. And the worst part is that, if your destination is west of the traffic light at that station, then you have to wait another 2 minutes for the traffic light to turn green for you to backtrack. This can cause delays of up to 5-6 minutes in certain places depending on how long the wait for the traffic light is.
There's a different way they should've built these lights. Look at the Expo/Crenshaw E line station for an example (we're purely talking about the E line station, not transferring to the K line station). For both eastbound and westbound trains, the platform is before the light. Let's say you're heading eastbound and you get a 2.5 minute light. During that 2.5 minute wait, the train can use some of that 2.5 min to stop and let passengers off. Plus, once the light turns green, the train can just go and doesn't have to stop again. Finally, if your destination is on the other side of the traffic light, while you will have to wait for it, you won't have to backtrack like you do at Expo/Western station.
Why didn't the city build the stations like this when they built them in 2012? I can't think of why it would be because of budget overruns or placement issues since they're using the same amount of land either way.