Research Trends and Results

Verification of Vehicles’ Driving Route Monitoring
Technologies on Actual Roads
KANAZAWA Fumihiko, HeadSUZUKI Shoichi, Senior researcher
TANAKA Yoshihiro, Researcher
TSUKIJI Takahiro, Researcher
SHIMAMURA Yoshitomo, Guest Research Engineer
Intelligent Transport Systems Division, Research Center for Advanced Information Technology（Key words） Heavy vehicles, driving route monitoring, driving experiment, Position data acquisition accuracy
1. Introduction
In our country, rapid increases in repair costs andrenovation expenses have become a significant
problem due to the aging of the structures constructed
on and after the period of high economic growth.
The Intelligent Transport Systems Division has been
conducting the technical study of the systems tomonitor heavy vehicles’ driving routes and support
their appropriate driving pursuant to the vehicle
specifications with the aim of reducing their impact on
the life span of road structures.
This report is to describe the outline of the results ofthe fundamental verification experiment on thetechnologies for monitoring driving routes using theITS spot compatible on-board units and/or Tablet
devices implemented on actual roads in the fiscal year
2012.
2. Experimental method
To verify the technology for monitoring vehicles’
driving routes, we used the ITS spot compatible
on-board unit with GPS (On-board unit with GPS) andtwo types of Tablet devices A and B as on-board units.
Furthermore, we installed a high-performance GPS
antenna capable of collecting GPS data at 0.1 second
intervals in the test vehicle in order to verify how theaccuracy is enhanced through map matching of thedriving position data.
Shown in Table 1 are specifications of on-boards
units and the items of data collected. The route(245km) on the Tomei expressway is shown in Fig. 1is an example of a driving route.
Table 1 On-board units’ specifications and theitems of data collected
On‐board unit with GPS Tablet device A Tablet device BGPSGPSGPS/GLONASS
Every 200 m travel/
Every 1 minute
45°turning angle
On‐board unit ID, date,Date, time stamp,Items of data collected time stamp, geographic
geographic coordinates
coordinates etc.
GNSS type
Probe data
accumulation interval

Fig. 1 Running routeFig. 2 Section withsound insulation walls

3. Experimental results
In the section with sound insulation walls (Outwardand homeward 26km) on the driving route shown in Fig.
1, we have compared the GPS data obtained through theon-board unit with GPS and Tablet devices with the GPSdata obtained through the high performance GPS antenna
at the same time to verify the accuracy of themeasurement data of the respective on-board unit on
making the high-performance GPS data as the reference
value. Table 2 shows the result. As there were founddifferences in the accuracy of the measurement data by
on-board units, we find that position grasping accuracy ofrespective on-board unit differs by roadside conditions.
Table 2 The accuracy of measurement dataof each on-board unit
Item
On‐board unit with GPS Tablet device A Tablet device B
Distance from thereference value
8.0
12.9
11.8
(average, (m))
Standard deviation (m)
2.89
7.29
7.82
Median (m)
7.75
12.89
7.82
Number of data
132
1231
1131

4. Future plan
We plan to verify also the accuracy of themeasurement data under different roadside conditions
or environments such as high-rise building streets andunderneath elevated road structures. We also plan toinvestigate the judgment method of the routenoncompliance by using the obtained driving routedata. Hereafter, we will establish the verification
testing system based on these results to study how tomake the task on nationwide function verification andactual deployment clear.
【Reference】
・Research on Voice-output ITS SPOT-onboard units
with GPS system, 10th ITS symposium 2011,
Vol.10 ,67-72