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Home My WebLink About2.c. Shannon Parkway - 145th Street to Connemara TrailAGENDA ITEM: Shannon Parkway 145 Street to Connemara Trail AGENDA SECTION: D I S (us 5, 0 PREPARED BY: Andrew J. Brotzler, PE, City Engineer AGENDA NO. 2. C ATTACHMENTS: WSB Memorandum dated March 4, 2009; Updated Cost Estimate; Layout APPROVED BY: 1)1J RECOMMENDED ACTION: Discussion and Direction ROSEMOUNT BACKGROUND: CITY COUNCIL City Council Special Work Session: March 11, 2009 EXECUTIVE SUMMARY In October 2008, Council discussed resident concerns related to the speed of vehicles on Shannon Parkway between 145 Street and Connemara Trail. At the time, based on the information available, it did not appear that a change in striping from 4 -lanes to 2 -lanes with a center turn lane was warranted. It was noted that as a follow -up to the discussion of this matter that traffic counts and a speed study would be completed. Attached for Council review and consideration is a memorandum from Chuck Rickart with WSB Associates, Inc. that provides a snmmaty of the traffic counts and speed study completed October 27 through October 31, 2008. Based on the information within this memorandum, it is recommended that Council further consider converting this segment of Shannon Parkway from 4 -lanes to 2 -lanes with a center turn lane. Based on recent bid prices for the seal coat and striping joint powers agreement which the City is a party to, the estimated cost to modify the striping on Shannon Parkway is $27,300.00. This amount is lower than the estimated amount of $54,800.00 within the feasibility report. The difference is primarily a result of lower costs for striping based on the use of latex paint rather than epoxy paint. For the seal coat and striping joint powers agreement, the City will need to identify final quantities by the end of the month for work to be completed this summer. As such, Staff is bringing this item before Council for direction. The estimated cost associated with this project has been included in the 2009 Street Improvement Project budget. G: \Streets \Shannon Parkway\ ShannonRe- stripingCWS3- 11- 09.doc WSB Associates, Inc. Memorandum To: Andy Brotzler, PE City Engineer City of Rosemount Date: March 4, 2009 Infrastructure Engineering Planning Construction From: Chuck Rickart, PE, PTOE Transportation Engineer Re: Shannon Parkway 14? Street to Connemara Trail Speed and Traffic Volume Study City of Rosemount, MN WSB Project No. 1005 -99 701 Xenia Avenue South Suite #300 Minneapolis, MN 55416 Tel: 763 541 -4800 Fax: 763 541 -1700 In October 2008, a review of the operation and safety for Shannon Parkway between 145 Street and Connemara Trail was prepared at the City Council's request. This review included looking at the existing four -lane roadway section in the corridor and evaluating several alternatives for improving safety and operation of this segment of roadway. Final conclusion of that meeting was to further evaluate the restriping of the roadway from its existing four -lane configuration to a two -lane configuration with striped shoulders and a center left -turn lane. In addition, it was requested that more detail speed and traffic information be collected prior to making the geometrics (striping) changes in the corridor. The purpose of this memorandum is to document the updated existing speed and traffic volume information in the corridor. Traffic Volume Data Traffic counts were conducted in the corridor during the week of October 27 through October 31, 2008. These counts included 24 -hour average daily traffic counts just north of 145 Street and just north of 143 Street and AM and PM peak hour turning movement counts at the intersections of 145 Street and Connemara Trail. ACEC 2008 Firm of the Year Minneapolis St. Cloud Equal Opportunity Employer, Sailagffermorry FieV 1 ke Memorandum Andy Brotzler, PE March 4, 2009 Page 2 of 3 As can be seen from the attached figure, the average daily traffic just north of 145 Street is 5,100 vehicles per day and just north of 143 Street drops to 4,400 vehicles per day. The AM and PM peak hour turning movement counts show a predominant movement from Shannon Parkway to east 145 Street and east Connemara Trail during the AM peak hour and a similar reverse movement from Connemara Trail and 145 Street to Shannon Parkway during the PM peak hour. Although movements to the east are heavy, there are indications that movements to the west are almost as predominant during certain periods of the day. The results of the turning movement counts indicate that right- and left -turn lanes should be provided at both 145 Street and Connemara Trail as part of the restriping project. Speed Data As part of the traffic volume counts conducted during the week of October 27 through October 31, speed data was also collected at the locations illustrated on the attached map. The speed data comprised of documenting the number of vehicles traveling at specific speeds for both northbound and southbound traffic just north of 145 Street and just north of 143 Street. The results of the speed data collection is shown in the table below: Speed Data Table North of 145`" Street Northbound Southbound North of 143 Street Northbound Southbound Average Daily raffic 2,680 2,463 2,305 2,103 43 41 39 41' Percentile Speed 51 48 46 48 Number of Vehicles over' 40 mph 2,201 1,437 1,977 1,228 C ^Doerooenls and Erlm6bdV.ud 9min`iMe perry Internet FOe0011H/3WEMO+h adr -013W9.doe Memorandum Andy Brotzler, PE March 4, 2009 Page 3 of 3 The average speed collected is that in which 50 percent of the traffic is traveling at or above and 50 percent of the traffic is traveling at or below. The 85 percent speed is the speed in which 85 percent of the traffic is at or below. The 85 percent speed is typically at or near the posted speed limit As can be seen from the above table, there is a significant number of vehicles traveling above the posted speed limit, and the 85 percentile speed in the corridor is well above the posted 40 mph speed limit. Conclusion/Recommendation The previous conclusions recommended that the four -lane roadway striping be maintained. However, based on the most recent speed and traffic count data collection, that conclusion has been modified. Restriping the roadway to a two -lane street with a center left -turn lane and striped shoulders in conjunction with increased enforcement is anticipated to provide some reduction in vehicle speeds in the corridor, thus providing improvement of safety for both vehicles and pedestrians. Therefore, based on the findings of the updated data collection, the following revised recommendations are made: 1. Restripe the roadway as proposed previously to a two -lane facility with striped shoulders and center left -turn lane. This would include striping right- and left -turn lanes at the intersections of 145 Street and Connemara Trail. 2. Install driver feedback signs at two locations in the corridor to help make drivers more aware of their speed traveling though the corridor. 3. Increase enforcement in the corridor in conjunction with the above improvements. K: \01005-99\ Cad\ Pion\ f ig -0Ldgn 10) 11 (179) 156 —4. (56) 6 k- 26 (12) 4-- 132 (143) 0 29 (52) RO SEMOUNT 701 ,enia Avenue South, Suite 300 Minneapolis, MN 55416 www.wsbeng. com a As.sociulea, Inc 7;3:414800 Fax 761- 541 -1700 URE ERIN, PLANNING CONSTRUCTION MINNESOTA X (XX) AM PEAK HOUR PM PEAK HOUR AVERAGE DAILY SPEED COUNT LOCATION Rosemount, Minnesota Bid Prices WSB Project: 2009 Street Improvement Project Design By: PO Project Location: City of Rosemount Checked By: City Project No.: 426 WSB Project No: 1668 69 Date: 3/3/2009 Item No. MN/DOT Specification No. Description Unit Estimated Total Quantity Estimated Unit Price Estimated Total Cost SHANNON PARKWAY IMPROVEMENT COST 1 2356.604 BITUMINOUS SEAL COATING SQ YD 18,600 $1.08 $20,088.00 2 2358.505 CRACK FILLING LIN FT 8400 $0.38 $3,175.20 3 2582.501 PAVEMENT MESSAGE (LEFT -THRU ARROW) PAIN' GAL 0.9 $81.03 $72.93 4 2582.501 PAVEMENT MESSAGE (RIGHT ARROW) PAINT GAL 1.4 $81.03 $113.44 5 2582.501 PAVEMENT MESSAGE (LEFT ARROW) PAINT GAL 3.7 $81.03 $299.81 6 2582.502 4" SOLID WHITE PAINT GAL 23 $14.26 $327.98 7 2582.502 ZEBRA CROSSWALK WHITE PAINT GAL 5 $81.03 $405.15 8 2582.502 4" SOLID LINE YELLOW PAINT GAL 13.4 $14.26 $191.08 9 2582.502 4" BROKEN LINE YELLOW PAINT GAL 3.7 $14.26 $52.76 10 2582.502 4" DOUBLE SOLID LINE YELLOW PAINT GAL 1.9 $14.26 $27.09 11 2582.502 24" SOLID LINE YELLOW PAINT GAL 0.6 $14.26 $8.56 Subtotal Shannon Parkway Improvement Total Shannon Parkway Improvement Project $24,762.01 5% Contingencies $1,240.00 Subtotal $26,000.00 5% Indirect Cost $1,300.00 Project $27,300.00