The tour buses, minibuses and Baht buses don't help, but the problem is simply the sheer volume of traffic, especially at weekends and on holidays, which the roads simply were never meant to handle. Of course, the dummkopfs in City Hall don't help, look at the huge mess they've created on Thepprasit which was once easily the fastest way to get to the beach from Sukhumvit. Long-term, though, I guess they'll watch what happens with the congestion charging scheme soon to be started in Bangkok and, if that's a success, we can probably expect to see something similar here.