I was just reading the second design and construction report for the Mississauga to Milton widening of the 401 that's going to start this year. There isn't a ton of information that I find interesting, but of note, the newly widened highway is going to be surface in asphalt and not concrete:
https://401expansion-mississauga-milton....struction-Report-No-2-January-2020-1.pdf
Quote:
4.1 Roadway Design
Highway Widening
The existing Highway 401 within the Project limits carries six lanes of traffic (three per direction) through Mississauga, Milton and Halton Hills.
The proposed Highway 401 will widen the existing six lanes to either 10 or 12 lanes total, with one High Occupancy Vehicle (HOV) lane in each direction. The 10 lane sections will include five lanes in each direction. The 12 lane sections will utilize the Core-Collector system, with three lanes in the Core and three lanes in the Collector, for a total of six lanes in each direction.
Figures 3 and 4 show typical cross sections for the 10-lane and 12-lane sections. While lane widths will be consistent throughout, median and shoulder widths will vary throughout the corridor. Throughout the entire Project limits the median separation will be by means of concrete barrier.
The horizontal alignment of Highway 401 will generally remain as per existing with a few minor adjustments for improved safety. Minor horizontal lane shifts will be required throughout the corridor to accommodate infrastructure that is to remain in place such as bridges and culverts. The Highway 401 vertical alignment will also generally match existing conditions but will require some adjustments to accommodate drainage requirements, meet clearances at existing bridges and simplify construction staging operations.
At the east and west Project limits, the roadway design will properly tie-in to match the existing highway alignment and cross section for a seamless transition.
WCC’s design is flexible (asphalt) pavement which will be utilized throughout the corridor, with the exception of the ramps in the Highway 401 and Highway 407ETR area, where rigid (concrete) pavement will be utilized for consistency with existing conditions on Highway 407ETR.
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Also, whomever took those photos above on this thread did a great job
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