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that he wanted to be sure were established before making a recommendation. He explained that in 2008, the code was changed to require that the critical speed be rounded to the nearest 5 mph increment rather than rounded down and that the 5 mph adjustment for unusual conditions was eliminated. The City of Pleasanton, as did other local agencies, issued a number of letters requesting modification of this language and a compromise was recently reached. While the method for rounding critical speed remains at the nearest 5 mph increment, the unusual conditions exception was reinstated and broadened to allow its implementation even if the presence of unusual conditions is not clear. He reported a total of 11 segments recommended for increase, 7 for decrease, and a number of additions and deletions to the ordinance related to changes in the California Road System maps. Mr. Tassano reviewed recommended changes to Andrews Drive. While the speed survey demonstrated a critical speed of 39 mph, which should be rounded to 40 mph, staff cited unusual conditions and is recommending lowering the speed to 35 mph. He noted that Andrews was surveyed in 2008 with a critical speed of 39 mph, posted speed of 40 mph, and a recorded speed limit of 35 mph. He subsequently changed the posted speed to match the ordinance and resurveyed the segment which again surveyed at 39 mph, essentially proving that motorists travel at the speed they feel to be appropriate and not the speed that is posted. Councilmember Brown expressed safety concerns related to the 11 segments recommended for an increase in the posted speed. Mr. Tassano explained that most studies indicate that collisions occur when there is a variance in speed. He said that artificially posting the limit on Santa Rita at 30 mph wculd create a mixed population of drivers who attempt to adhere to that and drivers who do not, which creates a larger safety issue than a slightly increased speed limit reflecting what the majority of motorists are travelling. Councilmember Brown asked how the transition is implemented. Mr. Tassano said signs are usually posted for the public 30 days prior to the change. Mayor Thorne asked and Mr. Tassano confirmed that this has a direct impact on the police department's ability to enforce speed limits. Mr. Tassano clarified that if a segment were not to comply with the code's guidelines, the police would be limited to citing unsafe speed for the conditions which is difficult to support. Councilmember Brown referred to Item K, Stanley Street to Ray Street, and asked if reducing the speed from 40 to 25 mph from one segment to another is a safety concern. Mr. Tassano said peak hour congestion on this segment is a much larger concern. He explained that the segment was historically posted at 35 mph citing unusual conditions but that only about 40% of vehicles complied with this. Vice-Mayor Cook-Kallio said the Council has also talked some about traffic calming measures as a method to reduce speed and asked what the nexus is between these measures and the code. Mr. Tassano explained that the law is written such than any significant change in a roadway requires that a new survey be conducted and that seemingly simple improvements like an overlay or bike lane produce significant enough changes to the character of the roadway to affect operating speeds. Councilmember Pentin asked whether basing critical speed on the 80th fastest vehicle rather than the 85% would result in a different recommendation. City Council Minutes Page 7 of 10 March 5,2013