Someone local should review this. If I read the pavement markings correctly that I see, you can merge left, but not right. In that case, the ramps need to be adjusted to reflect that.

Based on Bing imagery, I'd say this rail line isn't on a bridge. It also seems to go under everything here. This includes Jalan Barat, Lebuhraya Maju, and the ramps associated with Lebuhraya Maju. I could readily fix it, but would prefer comments from someone local.

Should this bridge connect the two paths? If so, it probably needs to be tagged as a path with bridge=yes.

I can't verify this bypass around the toll barrier exists. Can someone local figure out what's going on?

This area next to the hotel has changed since the Bing imagery as of today. This area will need to be updated.

This intersection has issues. I think the layer tag on the track track should be removed. But when I tried to use it, iD reported the track track was part of a relation that wasn't fully downloaded. Plus, a rail crossing probably should be added here.

Looks like the nearby tram tracks enter this building. I assume it's a depot.

I think the tracks and footways under the building should be made into tunnels. Then break the building up into 3 segments. The center one (where the plaza is) would be moved into layer 2.

It looks like these roundabouts should be treated as bridges. As is, this roundabout is drawn below other bridges that Google Maps suggests are lower. So there may need to be a layer change as well. I figure iD is complaining about it. But I'll let someone who knows the area implement any needed fixes.

The motorcycle lanes seem to go above Jalan Templer rather than below it on both sides of Lebuuraya Persekutuan. This appears to be the case when viewed from Google Street View and Bing Maps.