I notice that both Ecohill and Eco Majestic has many roundabouts but no traffic light, wonder roundabout will be more efficient than traffic light if implement in Sg Long.

or roundabout only efficient if the car volume is low?

Roundabout is much more efficient than traffic light if heavy traffic are coming from two sides only, with the condition of no bottleneck at the front part of the roundabout.

If heavy traffic are coming from 3 directions, 2 tier-roundabout is required, means lower is a direct route, while upper is for the traffic from other 2 directions. This one is being built at Setia Ecohill (as in the picture).

If heavy traffic are coming from 4 directions, i think need 2-tier as well (2 roundabouts up and down), upper for 2 directions and lower from other 2 directions (though I never see it).

ya since its a private concessionaire, expected already anyhow they would need cars to go through the tol. At least heading back to BSL from balakong side is free 

To be precise Bandar Damai Perdana, wonder the traffic there Vs Sg Long (either Palmwalk or Goodview Res at morning peak eg, going out 6.45-7am to KL City Centre. 

This proposal only work if there is a direct access to Silk (KL/Balakong direction) near by Petronas station, don't think MPKJ has this budget.

after 20 year ~ end of contract then plan and build take 10 year ~
wait 3o year lolz

Aeon Mkt Cheras too deep in. Bad access. Can only serve mkt Cheras/ Siao long people. Outsider Once goes in mkt Cheras sure stuck mati dalam.

Cheras selatan access far far better n next to highway. Serdang, balakong, Cheras south Lang, alam Damai / perdana , btho Lang, Seri kembangan Lang n manyak manyak lagi also come to Aeon Cheras south.

Honestly, dun see any improvement at SG long under pakatan rakyat Selangor goverment, I thnk they spent more effort on PJ, subang Jaya those places, kajang semenyih not under their priority.

today news . sungai long rental increase too much ... now condo 1 unit can stay 18 student even balcony also convert to room             

For me, not accepting it so moving out. U see other comment seremban also reach mv faster than bmc to kl.
even b4?go out to highway already have this unnecessary jam.
I stayed in bmc 8yrs , used to go out 6.30am can fly all the way to kl. now 5.50 am also jam till jusco. So when must we start leaving house at 5am? Just a matter of time. Don't see any solution up coming. No budget no budget. Wait approval. Same old excuse. Year in year out same.

Stay semenyih setia ecohill will reach the mines faster compare to mahkita Cheras, use lekas highway and silk highway, I guarentee you can reach the mines in 15 min during peak hour