‘The Perfect Highway Would Have no Onramps’
I’m quoted a bit in this piece by David Filipov in the Boston Globe about the travails of merging in Massachusetts. One of the main issues seems to be a variety of design standards, each with its particular codes of behavior:
“State highway officials are aware of the yield problem. Neil Boudreau, State Traffic Engineer for MassHighway, experiences it every day on his commute to Boston on I-93. It’s more of an issue for the state’s older highways, he said. Although they have been upgraded to meet national standards for speed limits set out in a guideline Boudreau calls “The Bible,” many Massachusetts roads “were designed for a different era.”
Today, the Commonwealth builds roadways with a longer acceleration lane for drivers entering the highway. (Take, for example, the Big Dig.) The new onramps don’t need yield signs because drivers going at the same speed in the same direction are able to merge easily, Boudreau said.
But as a result, there can be different rules for different onramps, sometimes on successive exits. At Exit 7 of Route 3 in Plymouth, the connection with the new, high-speed section of Route 44 features the newfangled onramps, but Exits 6 and 8 on Route 3 are old-style, with shorter acceleration lanes and a yield sign.”
It’s actually a bit ironic that longer onramps need to be built today, as cars accelerate much faster now than they did in the days of those short ramps; the problem, I suppose, is that mainline flow is going much faster and there’s so many more merging interactions these days.
This entry was posted on Monday, October 6th, 2008 at 10:52 am and is filed under Drivers, Etc., Roads, Traffic Engineering, Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.