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5.2 Reliability

In theory, MAX service may be more reliable than Route 113 for the following reasons:

  • Traffic signal priority and queue jumper reduce the variation in delay at signalized intersections.

  • Proof of payment fare collection (with use of multiple doors) reduces the difference in dwell time at times of lower or higher demand and thus reduces variability in trip times.

  • Fewer stops may also lead to less of a difference in delay due to the number of stops made between high-demand and low-demand times of day.

  • MAX is operated on a headway-based schedule.

  • Our analysis of AVL running time data showed that MAX travel time varies less between the peak and off-peak than route 113, and also less between different days of the week, although the latter result is based on limited data. In addition, there is more variation among trip times for Route 113. The standard deviation of running time (for a week’s worth of data) is 7.5 minutes for Route 113 southbound and 6.8 Route 113 northbound but only 5.9 minutes for MAX northbound and 3.0 minutes for MAX southbound.9

Passengers may also perceive MAX to be more reliable than Route 113 because it has a higher scheduled service frequency and is much less likely to be overcrowded. MAX is seen as more reliable than Route 113: 96% of MAX riders surveyed gave a positive rating (excellent or good) for reliability (see Table 5-10). In contrast, only 50% to 54% gave a positive rating for Route 113.

Table 5-10: Rate the Dependability of max and cat

April 2005

October 2005

MAX

CAT 113

MAX

CAT 113

Excellent

59.6%

7.1%

66.2%

19.6%

Good

37.3%

42.2%

30.2%

34.2%

Fair

2.2%

24.9%

3.1%

28.4%

Poor

0.9%

25.8%

0.4%

17.3%

Driver Assessment of Reliability and Speed

In addition to passenger surveys, the evaluation team conducted a driver survey that asked drivers to rate various MAX features for their contribution to route speed and service reliability as compared to the standard CAT vehicle. Almost all (95%) felt that multiple doors for entry and exit, off-board fare collection, and the queue jump improved speed and reliability. Most (86%) felt that signal priority at intersections improved speed and reliability and one driver (5%) felt this had no effect. 18 of the drivers (82%) felt that ADA passenger accessibility improved speed and reliability, two drivers (9%) felt this had no effect and one driver (5%) felt the ADA passenger accessibility reduced the speed and reliability on MAX compared to CAT service. 17 of the drivers (77%) felt that passenger accessibility improved speed and reliability and three drivers (14%) felt this had no effect. These results are summarized in Figure 5-3 below.

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