St. Charles County Transportation Plan 2030 - East-West Gateway ...

Rt. A
This five-lane road runs from I-70 to U.S. 61 and serves the General Motors plant and other
industrial development. Growth in residential and commercial development in the corridor has been
slow and is not expected to increase substantially by 2030. Some residential development may
occur to the north and this traffic may find its way to Rt. A. Also, some traffic from U.S. 61 and the
northwest part of Wentzville may find it convenient to access I-70. By 2030 traffic volumes are
expected to grow to around 18,000. Some signals exist at entrances to the GM plant and some
others may be installed but they and the road will operate at LOS C.
Rt. N
From Mid Rivers Mall Dr. to Rt. K this two-lane road is forecasted to handle around 15,000 per day.
Some intersection improvements are planned and traffic will continue to operate at LOS D. The
forecasted volumes could drop slightly if the planned Rt. 364 freeway is built.
From Rt. K to I-64 volumes are forecasted at around 30,000. However, should Rt. 364 be
completed, this traffic will move to the new road. If not, traffic from Rt. K to Bates Rd. will be split
between the old Rt. N and the new south outer road of Rt. 364. These roads will both operate at
LOS D during the peak hours with congestion at major intersections. West of Bryan Rd., Rt. N will
be three lanes and additional volumes will be handled at LOS D.
Additional improvements are planned for Rt. N through the proposed I-64/Rt. 364 interchange.
Some have been completed at this time and others may come later if Rt. 364 is built. The area
around the interchange has grown with major commercial development that is expected to continue
in the future. The new and proposed road improvements serving the area should be able to handle
traffic generated by this development at LOS D.
West of I-64 to Rt. Z, Rt. N is forecasted to have 22,000 vehicles by 2030. Many of the major
intersections will be signalized. This section may be widened to three lanes as it is on the
“illustrative” list in Legacy 2030 since the area is growing so rapidly. With growth expected in this
area of the County, three lanes may not be sufficient. Should four or five lane widening be
completed, the road will be able to handle the volumes at LOS D. If not, serious congestion can be
expected. New signalized intersections will have to be designed to handle the additional volumes.
Even with widening, the road will operate at LOS D with congestion at the major intersections.
Rt. Z
From I-70 to Rt. N, traffic on this road has been increasing with all the residential development in
the area. It is expected to continue in the future. By 2030 volumes will increase from 11,000 to
20,000. Widening of the road to three lanes is listed in Legacy 2030 as an “Illustrative” project.
Should it be built, it will be able to handle forecasted volumes at LOS D. Some intersections will
be signalized and they also will operate at LOS D. Congestion can be expected all along this road.
C-2.5. Major Collectors
These roads mainly serve adjacent areas and include some MoDOT roads and many county roads.
Congestion generally is not a problem. Major roads with higher forecasted volumes are discussed
below and others with lower volumes have been grouped together.
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