Caltrans officials said that temporary closures of the northbound 55 connector to the westbound 91 will probably be in effect until at least Wednesday.

Congestion caused by a road accident, Algarve,...
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The road will be shut down from 10 p.m. to 5 a.m. and 9 a.m. to 2 p.m. while work crews perform core drilling as a part of the 91 widening project.

The project is scheduled for completion in early 2013. The construction will add one all-purpose to lane in both directions between the 55 and the 241. The bridge for Imperial Highway and the Weir Canyon Road will also be widened.

This stretch of freeway is one of the most important parts of the road system in Orange County, according to transportation officials. It is also considered by many to be one of the most congested in the nation. For the communities in Orange and Riverside counties, the connector acts as a lifeline, because it is the only road that connects the two.

This portion of the 91 carries, on average, 174,000 vehicles in the eastbound direction and 160,000 on the westbound side.

In 2014, officials expect this number to increase to a daily average of about 158,000 to 190,000 per day.

The traffic congestion during the week in the morning and afternoon peak periods leaves many motorists stranded and delayed.

The No. 4 lane on the 91 freeway from Lakeview and Tustin avenues and the Tustin and Lincoln avenues on the northbound side of the 55 are also temporarily closed.

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