8140 Walnut Hill Lane, Suite 1000
Dallas, TX 75231
tel:
214 346-2800
fax:
214 987-2017
SH 99 Corridor, Segments H and I, Data Collection Project
Speed and Delay Data Files
CDM Smith has conducted travel runs to gather speed and delay information on several routes in
the SH 99 H and I corridor. This data was gathered in the field by using Global Position System
(GPS) receivers during peak periods. Time and distance is gathered from the GPS receiver every
0.05 mile and then the operating speed is calculated using a spreadsheet. The data files in this
folder contain the information that was collected in the field as well as a concise output of the
speed and delay information.
The raw data that is collected directly from the GPS receiver and it is saved in text files. Each
route folder contains a text file with the raw data and the spreadsheet output of the speed and
delay runs in one direction for that route. For most of the routes only one run of the route was
made in the morning peak period. If the no congestion was observed, it was felt that no additional
data needed to be collected. In other cases the driver will repeat the run on the route throughout
each peak period. The time periods driven are the morning peak from 6:00 AM to 9:00 AM, and
the evening peak from 4:00 PM to 7:00 PM.
The first sheet on the spreadsheet files shows the raw data. The second sheet, labeled summary,
shows the raw data for the specified route used by the spreadsheet tool. The beginning and end
points of the route in one direction are specified and the spreadsheet tool identifies only the data
that lies between these points. The following sheets show each run in the specified direction.
Each speed and delay run is included in separate sheet tabs identified by the start time of the
travel run. The sheet is identified with the route name, the direction traveled, the run date and
the start time of the run. Below this is a list of the cross streets along the route and the distance
the cross street is from the start of the route. The total travel distance in miles, the total travel
time in hours minutes and seconds (hh:mm:ss), and the average travel speed in mph are shown.
The collected data was then plotted with distance in miles on the X axis, speed in mph on the
primary Y axis, and cumulative time on the secondary Y axis. The plot also includes the location of
the listed cross streets. Below the plot the data for the plot is listed in three columns as well as
the data series for the cross street markers.
It is important to note that the total distance traveled and the exact location of the cross streets
can vary by + or – 0.05 miles. This is because the GPS receivers only record data every 0.05 miles
and the exact location of the first point and last point along a route can be different by about this
distance for each speed and delay run.