The new Sukhumvit road, through Jomtien, Ban Amphur, Bang Saray, Sattahip, and beyond, is now an 8-10 lane urban motorway. I live in Bang Saray and journey times are massively reduced either north or south, which is great (for me).
However, IMO, it's absolutely unsuitable for cycling (nor for slow moving sa-ling, kids on scooters, etc.) - and no allowance was made for those vehicles when the new road was planned. Also, pedestrian crossings/bridges are few and far between, so I often see pedestrians chancing their luck across the 4/5 lanes in 80-120 kph traffic.
Can you imagine pedestrians being permitted to walk in the roadway on an UK motorway or German Autobahn!
I'm afraid that we will read of a lot more deaths on this new road.