Saturday, July 26, 2008

Design of Expressways

A friend made this observation. The traffic along East Coast Parkway (ECP) was quite smooth. The traffic along the Central Expressway (CTE) was congested. Why?

ECP started at Changi Airport with fewer lanes. As it moved towards the city, additional lanes are added when the slip roads join the ECP. From three lanes, it became four lanes and five lanes. When the slip road takes traffic away from the ECP, the number of lanes reduced.

CTE was not designed in a similar way. He said, "We did not learn the lesson from the success of ECP". The number of lanes along CTE did not change in a similar fashion.

I do not know if his observation is correct. But it is a point worth exploring!

1 comment:

  1. It's not the number of lanes. It's the number of entries and exits and their proximity to each other.


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