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• Observations: <br />The results of the trailer speed survey do indicate that a few drivers are traveling at <br />unreasonably high speeds. Six of the 745 vehicles monitored over the two day period <br />were identified traveling more than 10 miles over the posted 35 mph limit with the fastest <br />speed at 53 mph. Generally, speed limits are set at the speed that 85% of drivers are <br />traveling at or lower than, which is referred to as the 85`"percentile speed. In this case 85 <br />of vehicles are traveling several miles per hour lower than the posted limited. <br />The probability of success in slowing down speeding drivers by posting stop signs is <br />highly unlikely. Would a driver violating the traffic laws by traveling at 50 plus miles per <br />hour stop or even slow down for a stop sign, particularly when it is quite unlikely that <br />another vehicle will be approaching? On the other hand, the vast majority of drivers that <br />are traveling reasonable speeds would legally be required to stop even though sight <br />distances are good and there is no approaching traffic. This is some of the reasoning that <br />the Uniform Manual on traffic Control concludes that; <br />STOP signs should 12ot be used for speed col2trol. <br />STOP signs should be ilstalled in a manner that minimizes the number of <br />vehicles having to stop. <br />• In many low volume situations wit1212o unusual history of intersection crashes, <br />no contrrol is a cost effective strategy. Research suggests that at most locations, <br />incYeasing the level of intersection control will not i12Zp1'ove safety. <br />A STOP sigh should not be installed on tl2e major' street unless justified by a <br />taff C e12gI1Zee1'ing StZldy. <br />Recommendation: <br />Staff recommends that the existing signage at this intersection is appropriate and <br />recommends no change in the signage at the intersection of Riverdale Drive and Alpaca <br />Street. <br />Action: <br />Motion to reconunend to City Council that the existing signage at this intersection is <br />appropriate and recoirunends no change in the signage at the intersection of Riverdale <br />Drive and Alpaca Street. <br />Reviewed By: <br />Director of Public Works/Principal City Engineer <br />.Street Superintendent <br />• Assistant City Engineer <br />Public Works Street Supervisor <br />Police Chief <br />PW: .11/20/07 <br />-181- <br />