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

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Rt. 370 Rt. 370 is a six-lane Freeway with a 60-mph speed limit. It carries about 57,000 vehicles a day with 5,700 during the morning and afternoon peak hours. During the morning, eastbound traffic reaches 3,400 vehicles or about 1,150 vehicles per lane. During the afternoon, traffic is about the same. Truck traffic on this route is around 7.5 percent coming from I-270 and the Earth City Industrial complex in St. Louis County. Factoring for pcphpl gives 1,450 or LOS C. B-5.2. Expressways Operating conditions and the quality of service provided on Expressways are less than Interstates and Freeways even though they are normally four-lane divided highways. They have at-grade intersections, often signalized, and provide access to adjacent land use at specific locations. Their speed limits are lower and their design characteristics are less with sharper turns and steeper grades. As a result vehicle conflicts occur more often and interrupt the flow of traffic. The HCM 2000 designates LOS for Expressways in a similar way as for Interstates and Freeways. However, speed categories, v/c ratios, and traffic volumes are all less. Table 11, developed from HCM 2000 Exhibit 21-2, shows the criteria for determining LOS for Expressways. Morning and afternoon peak hour volumes were determined by applying a peak hour factor to the ADTs shown on Table 4. Various conversion factors were applied to these numbers to take into account the percent of trucks, intersections and interchanges, fluctuations in traffic, and other factors to get pcphpl. LOS for each direction of travel were calculated for each Expressway. Field observations were used to verify the LOS ratings that were calculated. U.S. 61 U.S. 61 from I-70 to Lincoln County, 7.3 miles, is four lanes divided with 55 and 65 mph speed limits. It has one interchange at Rt. A and a number of at-grade intersections. Traffic volumes remain the same at about 33,000 vehicles a day. The morning and afternoon peak hours are handling about 3,350 vehicles. The peak direction is southbound in the morning and northbound in the afternoon. There are about 1,000 per lane in the peak direction. Adjusting for trucks (15 percent) and other factors bring this figure to more than 1,100 pcphpl. From Table 10, this gives LOS C for the peak directions. The other direction has about 800 pcphpl or LOS B. U.S. 67 U.S. 67 from St. Louis County to Alton, Illinois is four lanes divided, 4.1 miles long, and has a 55 mph speed limit. It has a number of intersections including one at Rt. 94 that is signalized. It carries 31,000 vehicles a day. It handles the same amount of traffic during the morning and afternoon peak hours. During the morning, southbound traffic is highest with about 2,000, or 1,000 per lane. Northbound has about 1,400 or 700 per lane. In the afternoon the reverse is true. Adjusting for trucks (6 percent) and other factors, brings the peak direction to about 1,100 pcphpl and the other to 8,000. From Table 11, this gives LOS C and B respectively. The traffic signal at Rt. 94 does periodically interrupt traffic, however, field observations indicate this is just temporary and traffic speed, density, and the v/c, return to normal and the LOS designations are appropriate. 42
Criteria Table 11 Level of Service Criteria For Expressway Segments 43 LOS A B C D E Free Flow Speed = 60 miles per hour Maximum density (pc/mi/ln) 11 18 26 35 40 Minimum speed (mi/h) 60 60 59.4 56.7 55 Maximum v/c 0.3 0.49 0.7 0.9 1 Maximum hourly volume (pcphpl) 660 1080 1550 1980 2200 Free Flow Speed = 55 miles per hour Maximum density (pc/mi/ln) 11 18 26 35 41 Minimum speed (mi/h) 55 55 54.9 52.9 51.2 Maximum v/c 0.29 0.47 0.68 0.88 1 Maximum hourly volume (pcphpl) 600 990 1430 1850 2100 Free Flow Speed = 50 miles per hour Maximum density (pc/mi/ln) 11 18 26 35 43 Minimum speed (mi/h) 50 50 50 48.9 47.5 Maximum v/c 0.28 0.45 0.65 0.86 1 Maximum hourly volume (pcphpl) 550 900 1300 1710 2000 Free Flow Speed = 45 miles per hour Maximum density (pc/mi/ln) 11 18 26 35 45 Minimum speed (mi/h) 45 45 45 44.4 42.2 Maximum v/c 0.26 0.43 0.62 0.82 1 Maximum hourly volume (pcphpl) NOTE: 490 810 1170 1550 1900 The exact mathematical relationship between density and v/c has not always been maintained at LOS boundaries because of the use of rounded values. Density is the primary determinant of LOS. LOS F is characterized by highly unstable and variable traffic flow. Prediction of accurate flow rate, density, and speed at Los F is difficult.
Page 1 and 2: THE ST. CHARLES COUNTY TRANSPORTATI
Page 4 and 5: Table of Contents (Continued) Chapt
Page 6 and 7: Table of Contents (Continued) Chapt
Page 8 and 9: List of Figures Figure Page 1. Coun
Page 10 and 11: List of Acronyms/Terms AASHTO Ameri
Page 12 and 13: investment scenarios. Also, more ac
Page 14 and 15: doubled, going from 46,354 to 101,7
Page 16 and 17: C. Present Land Use Basic inputs in
Page 19 and 20: Mueller Rd., Elm Point Rd., and Lit
Page 21: land is available for additional de
Page 24 and 25: Interstate highways serve traffic w
Page 27 and 28: other uses as well. They generally
Page 29 and 30: Table 4 Average Daily Traffic Volum
Page 31: U.S. 67 is a four-lane expressway t
Page 35: Figure 4 Year 2004 Average Daily Tr
Page 39 and 40: Rt. N has two major parts which are
Page 41 and 42: Table 6 Missouri River Crossings Ch
Page 43 and 44: Table 7 Average Daily Traffic Volum
Page 45 and 46: adds to the amount of VMT that is f
Page 47 and 48: Criteria Table 10 Level of Service
Page 49 and 50: I-64 From the Missouri River to wes
Page 51: I-70 west of U.S. 40/61 to Pearce B
Page 55 and 56: speed of 50 placing it at LOS C. Th
Page 57 and 58: Jungermann Rd. This road runs from
Page 59 and 60: B-5.5. Major Collectors Major Colle
Page 61 and 62: U.S. 67 experienced no delays and t
Page 63 and 64: Road Beginning End Table 14 Travel
Page 65 and 66: southbound from I-70 to Rt. 94 was
Page 67 and 68: • The consultant sent out questio
Page 69 and 70: F. Aviation St. Charles County has
Page 71: B-1.1 MoDOT Roads Number of Crashes
Page 74 and 75: Table 16 Missouri Department of Tra
Page 76 and 77: Crash Rates The crash rate is the b
Page 78 and 79: Table 19 Missouri Department of Tra
Page 80 and 81: B-1.2. Comparison of MoDOT Roads to
Page 82 and 83: Road Table 22 St. Charles County Ma
Page 84 and 85: Table 24 St. Charles County Major R
Page 86 and 87: B-1.4 MoDOT and County Crash Rate C
Page 88 and 89: No. Road Segment Crashes From To Mi
Page 90 and 91: The Council’s long range plan dis
Page 92 and 93: A. Background V. Present Transporta
Page 94 and 95: St. Louis. The next or “Second Ti
Page 96 and 97: County Preservation Table 28 Transp
Page 98 and 99: D-1. Mode of Travel to Work For 200
Page 100 and 101: to I-64, and Winghaven Blvd./Bryan
Page 102 and 103:
When a new interchange is built eas
Page 104 and 105:
taking into account future improvem
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Figure 8 Year 2030 Forcasted Travel
Page 110 and 111:
100
Page 112 and 113:
I-64 Summary Traffic volumes on I-6
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With an additional lane eastbound (
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By 2030 volumes are expected to rea
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passes through the signal of the no
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Rt. A This five-lane road runs from
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of future travel conditions. Some m
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Winghaven Blvd. Rt. N to I-64. Wing
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severity, and the crash rate (crash
Page 128 and 129:
118
Page 130 and 131:
B-1. MoDOT Roads The following part
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122
Page 134 and 135:
study should be low, however, impro
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public decisions, and does not mean
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APPENDICES
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APPENDIX B 2030 TRAFFIC VOLUME FORE
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Appendix B (Continued) Route/ Exist
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St. Charles County Transportation Plan 2030 - East-West Gateway ...

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