Research Trends and Results
Utilization system of probe information collected via ITS spot
Intelligent Transport System Division, Research Center for Advanced Information Technology
KANAZAWA Fumihiko, Head
SAWADA Yasuyuki, Senior Researcher
TANAKA Yoshihiro, Researcher
NAKAMURA Satoru, Guest research Engineer(Key word) Probe, Utilization system, ITS spot

2. Development for prototype of utilization system
National Institute for Land and InfrastructureManagement is currently developing an utilization system
which allows facilitated data collection and display using
Road Traffic Probe Data and integrated probe information(Integrated group composed of Road Traffic Probe Data andprivate sector probe data) intending to allow roadadministrators to monitor road condition, etc.
We have developed a prototype system operable asstandalone selecting following functions considering theneeds of road administrators, feasibility, and accumulated
data amount, and practicality at trial runs as the initial year
referring to the operation of road administrator.
(1) Time-space diagram writerThis is the function that displays pattern diagrams onscreen (Figure) together with outputting the summary
result of average travel speed classified in a specified routezone (DRM link) and time zone in report format.
Applications for quantification of effects through ex-postevaluations (reduction in travel time, etc.) is expected.
(2) Required travel time tabulator
This is the function to output summation of average
required time classified into a specified route zone (DRMlink) and time zone in report format. Applications in project
effect evaluation, etc. can be considered.
(3) Sudden acceleration and brake area mappingThis is the function that displays emerged areas ofsudden acceleration (back and forth acceleration), traveling
direction, and size (ranked color coding) in specified area.
Application is considered in cases such as extraction ofplace where traffic safety measures are required (areas
where rapid deceleration frequently occur), and traffic safetymeasure effect (comparison of abrupt deceleration
frequency before and after countermeasure taken).

3. Improvement of probe utilization system
Trial use of the prototype system was implemented byroad administrators and comments were recorded. With theresult of the comment reviewing such needsas ”Improvement of operability”, ”Summing of data in eachmonth or in each prefecture” and ”Summing of dataclassified by Standards for reference road section for trafficsurveys”, etc. were requested.
Based on these requests we are promoting system
improvement to realize a usability improved system such as
an internet applied system and operability improved system,and responding to wide range applications by selecting
given summary zones (DRM and Standards for referenceroad sections for traffic surveys).
Traveling direction

1. Collection of Road Traffic Probe Data
ITS spots allocated centrally at about 1,600 points allover Japan along the highways starting in 2011 year receive
transmitted probe information (travel record, etc.) on theroad side using vehicle loaded ITS Spot-compatible carnavigation system(sold starting in 2009 year) corresponding
to ITS spot. With this system large amounts of data can becollected at low cost when ITS Spot-compatible carnavigation systems become common. Also to monitor andprovide highly accurate road traffic information, efficientand an upgraded low cost road management operation canbe realized because records of travel speed can be collectedby broad range and in zone unit.

Select route on map
Blue line : designated
DRM link
DRM link No. can bedisplayed on map

Traveling direction

To monitor speed
degradation zone

Figure Output example of time-space diagram writer