20020672 Ver 3_Attachment 03 - US 74 Corridor Travel Time Memo Final 102413_20141124

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determine current average travel speeds throughout an entire 24-hour period during weekday
conditions, peak and off-peak conditions, and to validate March 19th-21st results.

Comparison of Travel Time and INRIX Data
Travel time run results and INRIX data were compiled for the US 74 corridor limits and are shown in
Table 1. Overall, field collected corridor travel time speeds are approximately 40 mph with a 32
minute travel time along the 22.5 mile corridor. INRIX data results calculate corridor travel time
speeds of approximately 44 mph with a 30 minute travel time. In comparison, INRIX data generally
shows slightly lower average travel times (by 6 to 11%) and slightly faster average travel speeds (by 6
to 11%). It is important to note that while both sets of data are based on different methodologies,
travel times and speeds are relatively similar with the INRIX data being consistently higher. Field
travel time runs were based on a limited number of continuous 22.5 mile corridor runs using the
floating car technique. INRIX data is based on GPS-enabled vehicles and devices in a variety of
vehicle types and driver characteristics that are making a combination of continuous and segmented
trips within the corridor. INRIX does not explicitly produce or provide corridor travel times, but rather
provides segment travel times that can be compiled to calculate a travel time along identified roadway
segments.
Table 1 – US 74 Corridor Travel Time and INRIX Data Summary

Field Runs INRIX Data
Travel Time Average Speed Travel Time Average Speed
(minutes) (mph) (minutes) (mph)
AM
Eastbound 32.0 41.7 30.2 44.9
Westbound 33.1 40.5 31.2 43.6
Cumulative 32.5 41.1 30.7 44.2
Noon
Eastbound 30.4 43.9 30.7 44.2
Westbound 34.9 39.1 31.0 43.7
Cumulative 32.9 41.3 30.8 43.9
PM
Eastbound 34.0 39.3 30.2 44.9
Westbound 33.7 39.7 30.7 44.2
Cumulative 33.8 39.5 30.4 44.5
* US 74 corridor approximately 22.5 miles from I-485 (west of Stallings) to Elm Street (in Marshville)
* Travel time runs and INRIX data were collected and compared between 3/19/2013 to 3/21/2013 (Tuesday thru Thursday)
for the AM (6:30-9:00 AM), noon (11:30-1:30 PM) and PM (4:00-6:00 PM).

Existing Travel Time Conditions
INRIX average speed data along the US 74 corridor was compiled for a two month period, shown in
Table 2 (page 3), to evaluate existing travel time conditions. Overall, the US 74 eastbound and
westbound corridor average travel speeds for the AM, noon and PM very closely correspond to the
INRIX results in Table 1. While minor variability is present, this is to be expected based on the
differences in each data set (time of year, length of collection period, etc.). Based on a review of
average hourly travel speeds throughout a 24-hour periods, at no time during the day are average
corridor speeds equal to or exceeding 50 mph.

Conclusions
In conclusion, the field runs and INRIX data travel times and average speeds are deemed valid for
use and comparison purposes. While the INRIX data calculated slightly lower travel times and
slightly higher average speeds, within 6% to 11%, the results are still reasonably similar based on the
variables between methodologies.

Based on the validation of INRIX data and a review of the Table 2, INRIX information demonstrates
that US 74 average corridor travel speeds are limited to less than 50 mph, even during off-peak
periods and free-flow conditions with very little to no congestion.
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LEGEND = Travel Time Study Corridor