5. PROGRAM EVALUATION (continued)

5.3.3 Speed Results

This is a straight roadway with a 30 mph speed limit. Only four waves of data were collected on this street. Wave 3 data were lost due to equipment failure. In addition to a moderate to high level of education and moderate enforcement, five sets of 3-D markings were placed on the roadway prior to Wave 4. The resulting speed profiles are shown in Table 63 and Figure 11.

On 95 th Avenue , the initial education and enforcement produced a noteworthy effect with a drop in mean speed and a particularly large drop in the number of high-speed drivers and the mean of their speeds. This effect increased in Wave 4 with the addition of the 3-D markings and was still evident, although somewhat diminished, at the end of the data collection period. It is unfortunate that data for Wave 3 were lost due to an equipment malfunction as they would have shed some light on the short-term persistence of the education and enforcement efforts before the installation of the 3-D markings. It is promising, however, that a meaningful reduction in mean speed with almost a halving of drivers in the 7+ mph over the limit category could be achieved by moderate education and enforcement alone.

The vehicle counts are quite consistent for Waves 1, 2, and 4 and then increase markedly in Wave 5 for no apparent reason. The fact that the speeds remain significantly below the baseline in spite of this increase in traffic suggests that the countermeasures were still working.

Table 63. Peoria – 95 th Avenue Speed Results

Figure 11. Speed Classes on Peoria – 95 th Avenue