5. PROGRAM EVALUATION (continued)

5.3.3 Speed Results

Moon Valley Drive is a 25 mph speed limit road with a segment that runs east and west on which only education and enforcement were applied. Three waves of speed measurement were collected (Waves 1, 4, and 5).

Table 66 and Figure 14 show that significant speed reductions were achieved on the east/west section of Moon Valley Drive without the use of any physical measures. The magnitude of the reduction is not as great as on Sweetwater, but the pattern is somewhat the same – a reduction in average speed and a shift to the lower class intervals from the 7+ miles over the limit category. A particularly interesting aspect of the results at this site was that the effect was maintained and even increased significantly between Waves 4 and 5. This suggests the possibility of some persistence of the education plus enforcement approach.

Table 66. Phoenix – Moon Valley Drive East/West Segment Speed Results

Although the number of vehicles observed dropped slightly from the baseline to the post waves, this drop cannot explain the observed pattern of results. For example, the total number of vehicles observed in Wave 5 was only 494 less than seen in Wave 1. Across the same measurement periods, the reduction in those going 7+ miles over the limit was 1,241, almost four times as great.

Figure 14. Speed Classes on Phoenix – Moon Valley Drive East/West Segment