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In order to assess the effectiveness of speed lumps, staff has compared the speed and volume <br />of vehicles on Crellin Road before and after the installation, as well as on adjacent roadways. <br />The table below shows both the before and after speeds on Crellin Road and some nearby <br />neighborhood streets. Before the installation of speed lumps, the critical vehicle speed on <br />Crellin Road was 34 mph, which declined to 28 mph after the installation of speed lumps. <br />Average Critical Speed in MPH <br /> <br /> Before After Before After <br /> Speed Count <br /> Eastbound Eastbound Westbound Westbound <br /> Location <br /> Thurs 4/24/04 Thurs 2/24/05 Thurs 4/24/04 Thurs 2/24/05 <br /> Creilin Rd Between 31.1 26.4 34.0 28.8 <br /> Lumps 1 & 2 <br /> Crellin Rd Between <br /> 35.9 27.6 34.3 29.6 <br /> Lumps 5 & 6 <br /> <br /> Parallel Street Samples <br /> 3228 Arbor Dr 33.6 35.0 33.1 31.0 <br /> Intersecting Collector Street Sample <br /> M ontevino N/O Northbound Northbound Southbound Southbound <br /> C restablanca 33.0 33.4 33.6 34.5 <br /> <br />Traffic volumes on Crellin Road decreased about 12% after the installation of the speed <br />lumps. This decrease of around 110 vehicles per day appears to have shifted to Arbor Drive. <br />This shift resulted in equalizing the traffic volumes on both streets. The total volume increase <br />on Arbor Drive represents about one car every 5 minutes during the peak hour. Other <br />neighborhood streets did not experience a significant change in volume. <br />Avera~le Daily Traffic Volume <br /> Before After Before After <br /> Traffic Count <br /> Eastbound Eastbound Westbound Westbound <br /> Location <br /> Thurs 4/24/04 Thurs 2/24/05 Thurs 4/24/04 Thurs 2/24/05 <br /> Crellin Rd Between <br /> 483 403 456 419 <br /> Lumps 1 & 2 <br /> Crellin Rd Between <br /> 397 314 355 299 <br /> Lumps 5 & 6 <br /> <br /> Parallel Nie~ hborhood Street Sample <br /> 3334 Arbor Dr 443 434 392 407 <br /> 3228 Arbor Dr 261 311 236 296 <br /> Intersectin, Collector Street Sample <br /> Montevino S/O Northbound Northbound Southbound Southbound <br /> Crestablanca 440 431 441 418 <br /> <br /> SR:05:223 <br /> Page 5 of 9 <br /> <br /> <br />