ivbss data collection and analyses - nhtsa · 2016. 11. 22. · 2009 its america annual meeting -...
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IVBSS Data Collection and AnalysesScott Bogard
UMTRI
2009 ITS AmericaAnnual Meeting
Session SS09
June 1, 2009
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Outline
• Descriptions of the types of analyses being performed
• Overview of the IVBSS data collection process and archiving
• Sample data from the car and truck platforms
2
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
FOT Analysis Themes
• UMTRI team– Drivers’ experience
• Exposure and alert rates– Safety impacts & driver interactions
• Changes in baseline and treatment condition driver behaviors
– Driver acceptance • Subjective assessment
– System performance• Categorization of alerts, alert rates
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009 44
Alerts Per 100 Mi (161 Km)
Individual drivers Mean
0.0
2.5
5.0
7.5
10.0
12.5
15.0
17.5
Overall Alert Rate by Individual Drivers
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Alert Experience Varies by Driver
38%
6% 31%
4%
21%
Driver 20113%
11%
51%
2%
23%
Driver 2028%
12%
61%
15%3%
Driver 203
17%
36%
37%
6%4%
Driver 204
14%
31% 48%
< 1%6%Driver 205
7%
21%
49%
4%
18%
Driver 206
20%
14%
50%
2%
14%Driver 207
41%
20%
29%
3%6%
Driver 208
16%
30% 51%
3%< 1%Driver 209
22%
9%
52%
11%6%
Driver 210
21%
34%
27%
4%
14%Driver 211
6%6%
44%
< 1%
44%
Driver 212
LDW-unoccupiedLDW-occupiedLCMFCWCSW
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Example - Forward Conflict –Analysis Steps*
17
-1.5
-0.8
Dec
el-to
-avo
id (m
/sec
^2)
Time to collision(sec)0 0
Region defining candidateconflict episodes
0.5
continues
10
0
5
10
15
20
25
4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10
Driver's mean enhanced TTC at brake onset (sec)
Num
ber o
f driv
ers
Week 1
Weeks 3, 4
* ACAS FOT [USDOT HS 809 901]
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Subjective Data
• Pre-drive questionnaires
• Post-drive questionnaires– On-site
• Driver debriefs• Focus groups
• Driver style • Driver behavior• General impressions,
combinatorial effects of warnings, acceptance, display & controls, ease of learning, individual warning types
• Events from their own driving
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009 8
Subjective Results(LV Extended Pilot Test)
Questionnaire topic MeanHelpful 6.3Attention‐getting 6.6Not annoying 6.1Not distracting 5.7Will increase driving safety 6.3
Selected results: mean ratings“Overall, how satisfied were you with the integrated system?”
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Data Acquisition & Archiving
On-Board Data sources: CAN buses – IVBSS, OEM 5 cameras with video capture &
compression 6 or 7 radars Onboard map match (LV) Second GPS Vehicle motion IMU Microphone GPRS cellular modem
• Driving records• Highway information:
– Michigan state base maps (e.g., intersections)– FHWA’s HPMS roadway information– Southeast Michigan Council of Government
maps (e.g., traffic signals)– Roadways mapped in previous FOTs
• Weather databases
Off-board Data Sources:
Onboard dataarchive
Offboard data
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Example DAS Performance
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Example Database Structure
Design optimized for:• Back-up • Query efficiency• Data loading
Views link tables in HtFotRadar and HtFotRaw to HtFot
Lv Design is similar
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Example SnapShot Viewer
Time 206133400 bytesFrame 411Avg. Size 3208 bytes
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Vehicle Data Signals and Volume Estimates
• 500+ data channels, plus 7 radar tracks• Primary: vehicle state, system measures • Summary: histograms, counts, aggregates• Diagnostic and health
13
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Light Vehicle Camera Views
• Insert LV EPT video clip of choice
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2009 ITS America Annual Meeting - Session SS09 – June 1, 2009
Heavy Truck Camera Views
• Insert HT EPT video clip of choice