This allowed the number of express lanes to match the number of travel lanes on the tollway.
In 2005, the tollway authority widened the express lanes from two lanes to three lanes in each direction.
Work on the project began in late 2010; the replacement of two bridges over the tollway was completed in 2011.
This marked the first time that the tollway authority had required local municipalities to contribute funds for interchange construction.
Several miles of these tollways had 60 mph environmental speed limits.
The general maximum speed limits on tollways and highways is 60100 km/h.
Conversion of the existing road to a tollway is planned, but the start date for toll collection will be a later phase of the project.
The tollway authority would build a water collection system to divert runoff from the arboretum.
