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

of future travel conditions. Some minor arterial roads are included in the discussion of Principal
Arterials as they provide continuity to the major road system.
Truman Rd. I-70 to Rt. 370
This road carried 7,500 vehicles north of Ehlmann Rd. in 2005. It is expected that growth in this
corridor will continue because of its close proximity to I-70 and Rt. 370. By 2030 it is expected that
volumes will increase to about 12,000. The road has five lanes and a number of signals that are
operating below their capacity. A number of signals may be added by the forecast date as the area
grows. However, the road should be able to handle forecasted volumes with only minor congestion
during the peak hours.
Jungermann Rd. Mexico Rd. to Rt. 94.
Jungermann Rd. has higher volumes on the north end near Mexico Rd. that decrease southward until
it gets close to Rt. 94. This is a very stable area that is not expected to grow very much. Forecasts
indicate a modest increase by 2030 to 34,000 south of Mexico Rd. and 26,000 north of what will be
Rt. 364. This five-lane road will handle these volumes with congestion reasonably close to what is
being experienced today. Some signalized intersections may be operating close to capacity during
the peak hours with substantial congestion.
Mexico Rd. Cave Springs Rd. to Jungermann Rd.
This section of Mexico Rd. has the highest volumes, around 32,000 in 2005. The area is reasonably
stable except for the possibility of additional commercial development on both sides just west of
Jungermann Rd. It is a five-lane road with numerous signals which are all working at capacity
during the peak hours. Forecasts indicate the volumes will rise slightly over the coming years and
reach 35,000 by 2030. It is expected the congestion will increase slightly but will only result in a
slight spreading of the peak hours.
Mexico Rd. Jungermann Rd. to Mid Rivers Mall Dr.
Mexico Rd. remains five-lanes through this section. It carried about 21,000 in 2005 and the area is
reasonably stable. Forecasted volumes are only expected to rise slightly with the normal growth of
traffic volumes and reach about 24,000 by 2030. The road will be able to handle these volumes
without any additional traffic congestion.
Mid Rivers Mall Dr. I-70 to Mexico Rd.
This five-lane section, of Mid Rivers Mall Dr., passes through a very high area of commercial
development that generated high traffic volumes, around 35,000 in 2005. The major generator is
Mid Rivers Mall and other development in the area and through traffic account for the high volumes.
There are five signalized intersections and they all are operating at capacity during the peak hours.
It is expected that by 2030 volumes will rise slightly to around 38,000 from a general increase in
traffic volumes. However, the area is fairly well developed. It is expected that the future increases
will cause severe congestion with backups extending from one signal into another. Traffic on the
side streets may increase also which will add to the congestion. It does not appear possible to build
any capacity adding features, therefore, the county should undertake a study to insure that all signal
coordination and optimization measures are implemented to insure the best flow of future traffic
through the area.
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