Q:
What is TravTime used for?
A: To quicikly and efficiently conduct GPS-based travel time, speed,
and delay studies.
Product information.
Q: Why is TravTime more efficient, cheaper,
safer, and more accurate than other methods?
A: Only one person is needed in the vehicle, reducing
data collection labor needs. Each driver has minimal
involvement with the GPS device, leaving him or her free
to concentrate on driving and the surrounding
conditions. Automated GPS and GIS methods are much more
efficient and accurate than manual data collection and
processing techniques.
Q: Do I need a specialized device to collect GPS data for TravTime?
A: No, any GPS device capable to logging GPS
points or NMEA sentences can be used to collect GPS data
for TravTime. However we suggest that you use the
GeoLogger™
to fulfill your GPS data collection needs.
Q: Can I use my existing GIS data with
TravTime?
A: Yes, TravTime lets you load ESRI Shapefiles. Thematic maps of the data can be created and
exported to report documents. You can view
attribute information for selected features in the
TravTime map window. You can also export
your routes and results as ESRI-complaint Shapefiles.
Q: What image formats does TravTime support?
A: TravTime can display a wide range of
geo-referenced image formats, in addition to GIS layers
(see above). Image formats include:
Q. If I don't have GIS layers or
geo-referenced images, can I see my GPS data on a map?
A: Yes. TravTime 2.0 provides a default
base map. This layer is composed of multiple tiled
raster images, similar to what is seen in Google or
Yahoo Maps. It can be useful for giving context to your
GPS data or if you do not have GIS Shapefiles or
geo-referenced image files.
Q: Does TravTime match the GPS data to a road
network?
A: Yes, TravTime lets you create a system of
link-based or points-based routes using a GIS interface.
All the editing tools needed to create and edit routes
are integrated in the TravTime user interface. Route
editing includes a ‘gap-filling’ routine that makes the
creation of link-based routes quick and easy. Users can
also create ‘checkpoints’ along a route that represent
controlled intersections.
Q: How automated is the processing of GPS data
into runs and statistics?
A: As automated as you would like. TravTime
makes extensive use of spatial computations to
automatically segment GPS data points according to your
defined routes. These segments can then be automatically
assigned to routes and grouped into scenarios and time
of day groups (TOD) for easy comparisons. At the same
time, all of these automated procedures can be performed manually for full control of the process.
Q: What statistics does TravTime generate?
A: TravTime generates statistics by run, route
or road segment. The following selected statistics are
provided for these elements:
- Minimum, Maximum, Standard Deviation, and Average Travel Time
- Average Speed
- Average Number of Stops
- Average Stopped Time
- Average Congested Time
- Level of Service (if street classification and
free flow speed are provided by the
user)
Q: Does TravTime compute level of service
(LOS)?
A: Yes, calculations and procedures conform to
the Highway Capacity Manual (HCM) and the Institute of
Transportation Engineers (ITE) Manual of Transportation
Engineering Studies.
Q: Does TravTime compute intersection delay?
A: Yes, checkpoints can be used to represent
intersections or other points of interest. TravTime
automatically computes approach delay for these
checkpoints. Delay components include:
- Control Delay
- Approach Delay
- Stop Delay
Q: What other information is computed by
TravTime?
A: Fields contained in the route summary output table
(one of nine reports), includes:
- Scenario and time period
- Route and compass direction
- Number of runs and days with run data
- Average run distance and speed of route
- Minimum, maximum, average and standard
deviation of travel times
- Average # of stops, stopped time and
congested time
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- Fuel consumption
- Average VOC, CO and NOX emissions
(grams)
- Route’s declared and computed free flow
speeds
- Route’s average Level of Service
- Travel Time Index
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Q: What graphs does TravTime generate?
A: The types of graphs available in TravTime are:
- distance vs. time
- speed vs. time
- speed vs. distance
- intersection/bottleneck analysis bar charts
Graphs can be copied
and pasted into other Windows™ applications, exported as
EMF files (high-quality vectors), and exported into .csv files in a format ready to be plotted
in your favorite spreadsheet/graphing application.
Q: Can I export the results into other
GIS and analysis programs?
A: Yes, TravTime allows you to export the
result statistics to plain text formats (.csv) for
further analysis in Microsoft Excel or other analysis
programs. You can copy the contents of any of the
reports into the clipboard for easy pasting into any
Microsoft Windows™ program.
You can also export raw
and processed GPS data and routes to ESRI Shapefiles
and to the Keyhole Markup Language (KML). KML is a
file format maintained by Google used to store
spatial entities and styling for
Google Earth and, to a
certain extent,
Google Maps.
You can also print maps, reports and graphs and export
them to EMF files, a high quality vector-based format.
More questions?
Please contact us
and a member of the GeoStats’ TravTime Team will contact
you within two business days.
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