speed compliance in work zones
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Transcript speed compliance in work zones
The effect of in-vehicle warning systems
on speed compliance in work zones
報告者:楊子群
James Whitmire II a,⇑, Justin F. Morgan, Tal Oron-Gilad c, P.A. Hancock
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Goals and Hypotheses
Research was to investigate the effectiveness of in-vehicle information technologies to
influence driver speed compliance in work zones.
Goals and Hypotheses
Reference
Method
Reference
Results
Discussion
Conclusion
Goals and Hypotheses
Reference
Method
Results
Participants
60 participants (27 males, 33 females).
Driver’s license with at least 3 years of driving experience.
Age:20-63 years.
Mean age:33 years, standard deviation:12years.
Normal hearing and had normal or corrected to normal vision.
Discussion
Conclusion
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Apparatus
General Electric fixed-base, I-Sim Patrol Sim driving simulator(three flat screens)
National Instruments LabVIEW
This software, integrated with the simulator, recorded all information on the simulator network at a rate of 60 Hz
(e.g., steering movement, brake and throttle inputs, and vehicle speed and position relative to other objects)
Bluetooth wireless connection
HP IPaq hx4700 Pocket PC
Visual warnings
0.5 s on and 0.5 s off.
Small speaker
Auditory warnings
Male’s voice
Presented at 60 dbc
/每秒60次
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Experimental design and procedures
8.9 km
2.1 km
105 khp
40 khp
Stop sign
One single right turn
7 min
Stop sign
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Experimental design and procedures
STEP1=> Participants were randomly assigned to one of the three stated levels.
(auditory, visual, or no warning)
STEP2=> informed consent process
STEP3=> filled out 1.simulation sickness questionnaire as a pre-screening device
2.driving history questionnaire
STEP4=> given a scripted verbal overview of the simulator followed by a orientation drive.
STEP5=> pre-NASA-TLX
STEP6=> began the actual test drive(approximately 7 min)
STEP7=> post-experience instance of the simulation sickness questionnaire and NASA-TLX
Goals and Hypotheses
Reference
Method
Results
Measures of driver response
Speed before and within the work zone
Total time in work zone
Total time in violation
Number of violations
Duration of violations
Lane deviation, acceleration, braking, and steering
Subjective mental workload
pre-post
Discussion
Conclusion
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Speed before and within the work zone
pre-entry driving speeds, served to demonstrate that there were no significant
24 s and 32 s post-work zone seed have significant.
group
24 s mean
32 s mean
post hoc comparisons
Control
56.8 kph
54.2 kph
Visual
47.6 kph
43.3 kph
B
Audio
40.7 kph
40.0 kph
B
A
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Total time in work zone
Analysis of variance revealed a marginal effect for total time in work zone F(2, 57) = 3.35, p = .08
Via Tukey’s procedure in a pairwise fashion:
Group
Mean /s
post hoc comparisons
Control
159.2
Visual
180.1
B
Audio
186.8
B
A
Goals and Hypotheses
Reference
Method
Results
Discussion
Total time in violation
The results for total time in violation showed statistically significant differences,
F(2, 57) = 5.05, p < .01.
post hoc comparisons with the use of the Dunnett’s C test:
Group
Mean /s
post hoc comparisons
Control
70.6(44%)
Visual
32.3(18%)
B
Audio
12.6(7%)
B
A
Conclusion
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Number of violations
showed no significant differences between these respective violation levels (p > .25).
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Duration of violations
The ANOVA indicated significant differences F(2, 59) = 8.81, p = .0005.
Tukey-HSD revealed:
Group
Mean /s
Post-compare
Control
25.7
Visual
8.9
B
Audio
3.3
B
A
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Lane deviation, acceleration, braking, and steering
lateral position following entrance into the work zone and subsequent vehicle position
for the first 110 s of the test scenario.
No significant differences between observed measures.
Goals and Hypotheses
Reference
Method
Results
Subjective mental workload
(pre – post) measures were significantly different.
1) Physical demand increased, t(19) = 2.82, p < .05
2) Effort increased, t(19) = 2.44, p < .05
3) Frustration decreased, t(19) = 3.52, p < .05
Discussion
Conclusion
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Multimodal presentation of these types of messages to be clearly received by the driver,
with only a minimal change in cognitive workload.
lack of other dynamic elements in the simulation as the driver traveled through the
environment alone with no companion or on-coming traffic.
results confirm that the audio modality is an effective channel through which to cue
the driver during a critical event.
results suggest there are indeed better ways to cue the driver to his or her speed within
a work zone as compared to regular road signage
Goals and Hypotheses
Reference
Method
Results
Discussion
Conclusion
Providing more efficient information communication to the driver will potentially prove
most beneficial.
Driver message should begin with brief auditory and visual messages.
(of duration no greater than a few seconds)
Followed by only a visual warning message which remains visible until compliance or
acknowledgment.
In closing,further research is called for in the specific auditory and visual characteristics
of such messages.