Walsh Construction Company will rebuild and widen the southernmost six-mile stretch of Pennsylvania Turnpike’s North Eastern Extension (Interstate 476) in Montgomery County, US.

The $151m project involves widening the toll road section from four to six lanes, and building 12ft-wide shoulders.

Seven mainline bridges, along with lighting, barriers, guide rails, retention walls and drainage systems will also be replaced.

Initial work will include installation of warning signs, clearing of trees and installation of erosion and sedimentation control measures.

Work is expected to commence at the end of the month and is scheduled for completion in 2013.

After work is finished on this southern stretch of I-476, the Turnpike will focus on widening the northern section, which includes four and one-half miles of toll road from Berks Road north to the Lansdale Interchange.

Scheduled to begin in 2014, the northern portion is expected to be completed sometime in late 2016.