What do you mean by filtering? I don't pass cars in the intersection, I'm not nearly fast enough, I generally just keep moving forward while they are stopped. There's plenty of room on the sides, even though it's not a dedicated lane, the roads are wider to accommodate cyclists, and since these are multi-lane roads, there's a dedicated left, right, and 2 straight lanes at each. I'm usually in the right side of the second lane, so there's people turning right beside me, and everyone to my immediate left I"m sharing with is going straight.