Interesting thing happening on Boylston St./Rte 9 at the Wellesley border: there are Jersey barriers (indicated by the grey line) preventing traffic on the main two lanes of eastbound westbound traffic from turning right onto Williams St. to head into the Wellesley Office Park.

Backing up …

About a half-mile west of Eliot St., the four lanes of Boylston St. become a flyover* and there are surface streets adjoining in each direction. Going eastbound westbound, the flyover ends just past Quinobequin and just before the entrance to the Wellesley Office Park. This creates a dangerous blending area. 

The flyover is indicated in blue. The Wellesley Office Park is indicated in white, the blending area is indicated in red.

Traffic from the main travel lanes that wants to go right into the Wellesley Office Park has to blend with and then cross traffic from the surface lane that is continuing west towards 128/95 and beyond to Wellesley. 

The mustard-colored line indicates traffic turning right onto Williams St. from the right lane of the flyover. The red line indicates traffic merging left from the surface street (also called Boylston St.) to enter traffic on Boylston St. and head west.

The traffic barriers are cutting off the movement from the main lanes crossing over the surface lanes onto Williams St. and into Wellesley Office Park. What it means is that drivers from east of the office park need to got onto the surface road before the flyover begins, just before Cragmore at the “exit” to Chestnut St.

This completely eliminates that blending conflict between traffic entering Boylston St. from the frontage road and traffic exiting onto William St. to go into the Wellesley Office Park.

This is a great resolution of the blending problem. It’s not at all clear if this is a permanent or temporary solution and how it relates to the new Route 9/128 interchange. Regardless, this solution — to remove a blending conflict — has interesting implications for other examples of blending problems, as I’ll describe in later posts.

* Crossing over Chestnut and Quinobequin/Ellis.

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