Kittery ME Interstate 95
Total Northbound Vehicles
2001
The JOHO image above is an example of the use of American
Image Inc.'s innovative visualization technique. Using JOHO,
you can make displays from your large traffic information bases. You can quickly
discern patterns and exceptions to the patterns, even in the large data sets
produced with vehicle sensors.
This image shows the total number of vehicles on Interstate 95 northbound in
Kittery, Maine for every hour in 2001. The image contains 8,760 data points.
This is far more information than traditional graphics programs can display.
Image Layout
The image has twelve panels, each showing one month in 2001, starting in the
upper left and ending in the lower right. As labeled on December’s panel, the
24 cells in the top row of a panel represent the hours in the first day of the
month. The bottom row of cells represents the last day of the month. The time
through each day is measured horizontally along each row, from the hour
beginning at midnight on the left to the hour beginning at 11 PM on the right.
Noon is halfway across the panel.
Each colored cell indicates the total number of northbound vehicles passing
the sensor at that day during that hour. The legend at the right indicates the
relation between color and number of vehicles. The image indicates counts of
fewer than 1,500 as the dark blue color at the bottom of the legend. At about
2,250 vehicles the color changes from green to orange. The white at the top of
the legend indicates a count of 5,500 vehicles or higher.
Image Interpretation
Traffic volume on I-95 is predominately affected by visitors coming to Maine
on the weekends. The image shows that the traffic volume has a consistent
pattern through the early part of the year. Northbound commuter traffic on
weekday afternoons is consistent throughout the year. On July and August
weekends traffic is heaviest on Friday afternoons when there are many visitors
entering Maine for vacation destinations.
The equivalent southbound image shows a somewhat different pattern.
More Traffic Information
This site also contains FHWA Type 11 images and
overweight FHWA
Type 10 images that show other examples of how the Maine DOT is
using JOHO to monitor their sensors and to understand traffic patterns
throughout the state.
JOHO images like this have a variety of
uses. JOHO’s unattended
processing features make it simple to update the images frequently.
A broken sensor is immediately apparent. The DOT can use the images to
understand traffic patterns for traffic light adjustment, roadbed design,
scheduling road repairs, and many other purposes.
JOHO can also make images of
other measured quantities such as speed for enforcement purposes.
