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

Rt. K
This road is a five-lane suburban arterial with extra lanes at signalized intersections. It is divided
into two segments, one on the north from I-70 to Rt. N and the other from Rt. N to I-64 on the south.
The north segment has 13 traffic signals and numerous entrances for commercial development along
its 3.1 mile length. Speeds during the morning peak hour are 30 mph southbound and 36 mph
northbound. This places it at LOS C which seems to be in line with the signal operations. During
the afternoon speeds are 25 mph southbound and 23 mph northbound. This places the LOS at D
which also is in line with the signal operations. Unfortunately, the signalized intersection of Rt. K
and Rt. N operates at LOS F during the afternoon peak hours. Traffic is stacked up on all
approaches and at times it takes more than one turn of the signal to negotiate the intersection. The
intersection is operating at LOS F or with volumes in excess of its capacity.
On the south segment there are seven signals along its 3.1 mile length. Speeds during the morning
peak hour are 42 mph northbound and 33 mph southbound. This places the northbound at LOS B
and southbound at LOS C. This seems appropriate for signal operations. In the afternoon peak
hour, speeds are 27 mph northbound and 37 mph southbound placing the LOS at D for northbound
and B for southbound. This seems appropriate for the signal operations. Although this road carries
substantial volumes (40,000 in the north and 25,000 in the south) and they have been increasing, the
wide road and good signal spacing have allowed traffic to move well. As volumes continue to grow,
maintaining the good LOS may be a challenge.
Rt. M (Main St.)
This road runs 2.5 miles from I-70 to Rt. 79 through old town O’Fallon on four lanes with parts on
the north and south widened to five lanes. It has six signals that operate at LOS D during both the
morning and afternoon peak hours. Speeds during the morning are 28 mph northbound and 24 mph
southbound. This places it at LOS D. In the afternoon, they are 23 northbound and 17 southbound.
Northbound is at LOS D and southbound has some congestion around I-70 placing it at LOS E.
Congestion through the old part of O’Fallon can be serious and occasionally aggravated by trains
crossing just north of downtown. At these times all traffic for some distance comes to a complete
stop. During the peak hour periods the road is operating at LOS E to F.
Mid Rivers Mall Dr.
This five-lane road runs from I-70 to Rt. 94, 4.5 miles and has 14 signals. Average speeds during
the morning peak hours were 26 mph northbound and 31 mph southbound. The signals operated at
LOS D, and E. During the afternoon peak hours speeds were 28 northbound and 30 southbound.
The signals operated at LOS D, and E. From I-70 to Mexico Rd. during the peak hours it is
operating with serious congestion. Volumes are quite high (36,000) due to all the commercial
development at and around the Mid Rivers Mall. All of the signals are operating at LOS E during
the morning peak hours and LOS F during the afternoon peak hours.
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