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CASE #1 <br />Background: <br />REPORT ON RIVERDALE SPEED STUDIES <br />AND REQUEST FOR STOP SIGN PLACEMENT AT <br />RIVERDALE DRIVE AND ALPACA STREET <br />By: Steven Jankowski, City Engineer <br />A petition was received dated August 1, 2007 which was signed by nine residents of the <br />Alpaca Estates subdivision located south of Riverdale Drive requesting that Stop signs be <br />placed on the east and west legs of the intersection of Alpaca Street and Riverdale Drive. <br />This- case was discussed at the October Public Works Committee meeting at which staff <br />reviewed the accident history, traffic counts, and sight distances This intersection has had <br />no accidents within the past five years aizd relatively low traffic. Staff recorrunended sight <br />distance improvements on the northeast coiner which have since been made, but no <br />change to the existing signage at this intersection. <br />There was a particular conceal over the speed of traffic proceeding through this <br />intersection and staff was directed to review the speed limit postings within this area and <br />also directed to set out the speed trailer. This will want traffic of the concern with speed <br />in the area and will also provide some data on the vehicle speeds on Riverdale Drive. <br />A review of the speed limit postings show that 30 mph speed limit signs were posted on <br />Armstrong Boulevard and Alpaca Street south of Riverdale Drive. No speed limit signs <br />were in place on Riverdale Drive. Speed limit signs of 35 mph have now been placed <br />along Riverdale Drive at four locations between Llama and Alpaca Streets. This speed <br />limit is consistent with the limit posted on sections of Riverdale Drive farther to the east. <br />The-speed trailer was set approximately 150 feet west of Alpaca Street to display and <br />record the speeds of veliicles on Riverdale Drive for 14.5 hours on Friday, October 26tH <br />and 11 hours on Monday, October 29th. Attached to this case are the output reports <br />provided by the speed trailer. Below is a summary of the results obtained from these <br />speed surveys• <br /> Friday <br />11/26(2007 Monday <br />11(29/2007 <br />Duration -hours 8:45 am - 10:45 m 7:30 am - 6:00 m <br />Duration - Time 14.5 hrs 11 hrs <br />Total vehicles 344 401 <br />Max s eed 53 m h 44 m h <br />85th Percentile S eed 32 m h 31 m h <br />No Vehicles > 40 m h 11 3.2% 4 1.0% <br />No Vehicles > 50 m h 6 1.7% 0 <br />-180- <br />