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Wandzia Grycz ' November 7. hump or a circle. The most significant result is that only 26% of the respondents wanted more circles. �yhil; 59% wanted more humps installed. A detailed analysis of this opinion survey and other traffic data. such as volume and speeds, is presented in the attached report. DISCUSSION The pilot program of speed humps achieved the initial objective of demonstrating the effectiveness of these devices to reduce speeds in San Leandro. "Before" and "after" speed surveys were taken about 100 feet from each hump and circle installation. These surveys indicate that the speed humps worked as planned and was successful in reducing the 85th percentile speeds an average of 9 mph from 32-38 mph to 24-29 mph. aiid practically eliminated all speeds above 35 mph. Prior to the installations, as many as 21 ° 6 of the dri% ers Were going over 35 mph. The speed humps also appear to be popular with the residents. since 5900 of [lie respondents to the opinion survey expressed a desire to have more humps installed. In contrast. only _'6% of' the respondents wanted additional circles installed. The circles were successful in reducing_ the 85th percentile speeds by an average of 8 mph from 31-36 mph to 24-26 mph. However. the circles presented a safety concern by displacing traffic 8 to 10 feet sideways so that some cars come in almost direct conflict with pedestrians crossing at the circles. Given this conflict, staff recommends the removal of all traffic circles. The speed humps and traffic circles do not appear to have influenced changes in traffic volumes: the only street which shows a significant increase. Juana, has both devices installed (if drivers are avoiding, these controls, Juana volumes should have decreased, not increased). The proportion of the total east -west traffic on Estudillo was 45.4% in October, 1995 rising slightly to 45.9% in October. 1996. This is not a significant increase in statistical terms, and is due most likely to random variation. With humps placed every 500 feet on Joaquin, Juana. Dolores and Maud, speeds between the humps would likewise be reduced along the entire length of these streets, rather than just near the devices. Three more humps would need to be added to each of these streets to achieve the desired speed reduction between Grand and Bancroft. Staff recommends the continued use of the 14 feet long speed hump at all locations, except for on Dolores and for one block on Joaquin. Dolores, with over 4,000 vehicles a day, requires the continued use of the gentler 22-feet long hump to minimize the potential of rear end accidents caused by the humps. This same kind of gentler hump is needed on Joaquin because A.C. Transit busses go one block westbound on Joaquin from Grand, before turning right onto Morgan. A.C. Transit has approved this location because the busses are already going slow in preparation for the right turn. Staff does not recommend the installation of any traffic circles or speed humps on Estudillo and Sybil, which are both arterials, for the following reasons: 1) both streets serve as emergency access routes, 2) the ITE guidelines for installing speed humps do not recommend them on streets with bus routes, 3) humps or circles on higher volume streets can cause rear end accidents, 4) even a minor shift in traffic from Estudillo or Svbil would be significant to the residents on the non -arterial streets in the neighborhood, and 5) humps or circles may result in peak hour congestion, especially on Estudillo. Therefore, the existing hump on Sybil should be removed. The Fire Department concurs with this recommendation which will allow the arterials to continue to be used as primary emergency access routes. 23