Laserfiche WebLink
<br />CASE #1 <br /> <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 /> <br />Background: <br /> <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 ofthe 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 accidentswithin the past five years and relatively low traffic. Staff recommended sight <br />distance improvements on the no],1:heast comer which have since b~en made, ~ut no <br />change to the existing signage at this intersection. <br /> <br />There was a particular concern over the speed of traffic proceeding through this <br />intersection and staff was directed to review the speed limit po stings within this area and <br />also directed to set out the speed trailer. This will warn traffic of the concern with speed <br />in the area and will also provide some data on the vehicle speeds on Riverdale Drive. <br /> <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 /> <br />The speed trailer was set approximately 150 feet west of Alpaca Street to display and <br />record the speeds of vehicles on Riverdale Drive for 14.5 hours on Friday, October 26th <br />and 11 hours on Monday, October 29th. Attached tothis 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 /> <br />Duration - hours <br />Duration - Time <br />Total vehicles <br />Max seed <br />85th Percentile Seed <br />NoVehicles > 40 m h <br />No Vehicles> 50 m h <br /> <br /> <br /> <br />m <br /> <br />1 <br />