On another thread someone recalled that I-93 north of Boston was opened early "reluctantly" in 1973 because of the gravel truck accident that damaged the Tobin Bridge. Ninety-three was already finished. What had been preventing it from being opened as soon as it was finished?
The governor thought opening it was going to cause a massive traffic jam, though I still consider it was much more stupid to build something and just let it rot but that was the thought process back then.
From Steve Anderson's Boston Roads site (bostonroads.com):
"STALLED AT SOMERVILLE: In 1965, after two years of planning, MassDPW commissioner Francis Sargent announced plans to construct the final three miles of the Northern Expressway through Somerville and Charlestown. The $100 million elevated section was to provide connections to the Central Artery (I-93), the Northeast Expressway (US 1) and the unbuilt Inner Belt Expressway (I-695). He pledged at the time that the construction of I-93 would [not] require the razing of any homes. However, more than 300 families and 90 businesses had to be relocated for the highway.
With construction of I-93 well underway by 1970, and with political sentiment growing against new highways, Sargent - now Massachusetts Governor - declared a moratorium on building new highways within MA 128 (Yankee Division Highway). However, the governor made an exception for the final three miles of I-93. According to highway officials, since the final link was being built with 90 percent Federal funds, it appeared less expensive to complete the project for $4 million in state funds than to forfeit the contracts for $10 million.
The final three-mile section of I-93 was completed on February 1, 1973 to little fanfare, but plenty of derision. Initially, full use of the highway was delayed because of an apparent engineering oversight that created a potentially hazardous situation where drivers from right-hand lanes sought to make left-hand exits. Taking advantage of the situation, House Democrats in Massachusetts passed a resolution naming the link the "Honorable Francis W. Sargent Highway," in honor of the Republican governor who initiated the project.