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Automated Performance Measures for Snow & Ice Results Ron Beane, Performance Measurement Administrator Office of Maintenance, Iowa DOT Highway Division [email protected] 515-233-7902 Discussion Question Relative Locations of Automatic Traffic Recorders [ Speed] - PowerPoint PPT Presentation
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Automated Performance Measures for Snow & Ice ResultsRon Beane, Performance Measurement Administrator
Office of Maintenance, Iowa DOT Highway Division
[email protected] 515-233-7902
Discussion Question
Relative Locations of Automatic Traffic Recorders [ Speed]
& Road Weather Information System [Road Surface]
Average Interstate Speeds
Noon Friday February 14 to Noon Sunday February 16, 2003
Comparison of Data for Average Speed & Road Surface
on I-80 Westbound between Mileposts 138 & 141
Videolog Pictures of I-80 Westbound between Mileposts 138 & 141
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Automated Performance Measures for Snow & Ice Results
Question: Will a comparison of existing data sources provide useful measures or indicators of the results of snow and ice operations with no additional data collection costs?
Possible Data Sources:1. Speed data from Automatic Traffic Recorders [ATR]2. Road surface and weather data from the Road Weather Information
System [RWIS]3. Physical layout from videolog pictures
Data: Data from one large statewide storm indicate that drivers’ perceptions indicated by average speed are compatible
with road surface measurements. Videolog pictures of the site with the slowest recovery of average speed show physical features that might indicate contributing factors to the recovery time.
Discussion: The sites shown on “Average Interstate Speeds” are listed from west to east on I-80, with the exception of
Ankeny on I- 35 a short distance north of the Altoona sites. The speed recovery time for Altoona eastbound
was noticeably faster than Altoona westbound. The pictures of Altoona westbound show the vegetation and embankments near the north edge of the roadway and the concrete barrier wall dividing the highway.
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Automatic Traffic Recorder & Road Weather Information System Locations
road_centerline_2002_road_primary_2002
RWIS Locations
Speed Sensors
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Average Interstate SpeedsNoon Friday February 14 to Noon Sunday February 16, 2003
20
25
30
35
40
45
50
55
60
65
70
752
/14
No
on
2:0
0 P
M
4:0
0 P
M
6:0
0 P
M
8:0
0 P
M
10
:00
PM
Mid
nig
ht
2:0
0 A
M
4:0
0 A
M
6:0
0 A
M
8:0
0 A
M
10
:00
AM
2/1
5 N
oo
n
2:0
0 P
M
4:0
0 P
M
6:0
0 P
M
8:0
0 P
M
10
:00
PM
Mid
nig
ht
2:0
0 A
M
4:0
0 A
M
6:0
0 A
M
8:0
0 A
M
10
:00
AM
2/1
6 N
oo
n
Time
Ave
rag
e M
PH
Shelby Atlantic Waukee Altoona WB Altoona EB Ankeny Williamsburg LeClaire
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SpeedLegend
MPH50 + MPH
35-49.9 MPH< 35 MPH
Date/Time Av Surface Temp ( CST ) Speed Status Surface Factor % IcePct Type 2/14/03 1:02 PM 70.2 Wet 36.1F 95 6% 0% Yes2/14/03 2:00 PM 71.0 Wet 36.0F 70 1% 0% Yes2/14/03 3:00 PM 70.9 Wet 35.4F 75 0% 0% Yes2/14/03 3:59 PM 71.0 Wet 34.9F 95 2% 0% Yes2/14/03 5:00 PM 70.2 Wet 33.7F 95 0% 0% Yes2/14/03 6:01 PM 67.8 Chemical Wet 32.4F 95 0% 0% Yes2/14/03 7:01 PM 59.5 Chemical Wet 32.0F 95 Yes2/14/03 8:01 PM 41.8 Chemical Wet 31.4F 95 0% 78% Yes2/14/03 9:06 PM 38.6 Chemical Wet 31.5F 95 Yes2/14/03 10:01 PM 38.3 Chemical Wet 31.5F 95 Yes2/14/03 11:01 PM 36.4 Snow/Ice 31.7F 30 0% 96% Yes2/15/03 12:05 AM 37.0 Snow/Ice 31.2F 5 0% 99% Yes2/15/03 1:06 AM 31.3 Snow/Ice 30.8F 5 0% 99% Yes2/15/03 2:04 AM 28.4 Snow/Ice 30.1F 5 0% 100% Yes2/15/03 3:01 AM 26.7 Snow/Ice 29.4F 5 0% 99% Yes2/15/03 4:02 AM 35.1 Snow/Ice Watch 28.9F 5 Yes2/15/03 5:02 AM 33.9 Snow/Ice Watch 27.8F 5 Yes2/15/03 6:02 AM 28.7 Snow/Ice Watch 27.1F 5 Yes2/15/03 6:59 AM 25.7 Snow/Ice Watch 26.3F 5 Yes2/15/03 7:59 AM 24.0 Snow/Ice Watch 26.6F 5 Yes2/15/03 8:57 AM 25.2 Snow/Ice Watch 26.3F 5 Yes2/15/03 9:57 AM 27.3 Snow/Ice Watch 26.4F 5 Yes2/15/03 11:01 AM 30.3
Snow/Ice Warning 27.2F 5 0% 99% Yes
2/15/03 12:02 PM 26.9Snow/Ice Warning 27.5F 5 Yes
2/15/03 1:01 PM 27.0 Chemical Wet 26.0F 95 Yes2/15/03 2:01 PM 32.4 Chemical Wet 29.4F 95 Yes2/15/03 3:04 PM 38.5 Chemical Wet 29.2F 95 None
Altoona WestBound I80Chemical Precipitation
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SpeedLegend
MPH50 + MPH
35-49.9 MPH< 35 MPH
Date/Time Av Surface Temp ( CST ) Speed Status Surface Factor % IcePct Type 2/15/03 4:01 PM 40.3 Chemical Wet 27.8F 95 None2/15/03 5:02 PM 36.3 Chemical Wet 25.7F 95 None2/15/03 6:02 PM 36.9 Chemical Wet 23.7F 95 None2/15/03 7:02 PM 32.3 Chemical Wet 22.6F 95 None2/15/03 8:01 PM 24.1 Chemical Wet 22.0F 95 None2/15/03 9:01 PM 39.1 Chemical Wet 20.7F 95 None2/15/03 10:01 PM 42.2 Chemical Wet 18.6F 95 None2/15/03 11:01 PM 43.2 Chemical Wet 16.3F 95 None2/15/03 11:59 PM 44.8 Chemical Wet 13.9F 95 None2/16/03 12:59 AM 40.6 Chemical Wet 12.6F 95 10% 83% None2/16/03 2:07 AM 47.1 Chemical Wet 11.8F 95 14% 80% None2/16/03 3:07 AM 48.9 Chemical Wet 10.5F 95 14% 80% None2/16/03 4:07 AM 44.0 Chemical Wet 9.5F 95 38% 48% None2/16/03 5:06 AM 45.6 Chemical Wet 9.0F 95 49% 32% None2/16/03 6:06 AM 47.1 Chemical Wet 8.1F 95 57% 22% None2/16/03 7:06 AM 45.9 Chemical Wet 7.5F 95 45% 42% None2/16/03 8:04 AM 51.4 Chemical Wet 9.2F 95 44% 39% None2/16/03 9:04 AM 55.4 Chemical Wet 15.5F 95 31% 41% None2/16/03 10:02 AM 55.1 Chemical Wet 22.0F 95 25% 22% None2/16/03 11:01 AM 58.4 Chemical Wet 28.0F 95 25% 0% None2/16/03 12:01 PM 61.8 Chemical Wet 32.3F 95 20% 0% None
Chemical PrecipitationAltoona WestBound I80
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I-80 Westbound Between Mileposts 138 & 139
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I-80 Westbound Between Mileposts 139 & 140
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I-80 Eastbound Between Mileposts 139 & 140
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I-80 Westbound Between Mileposts 139 & 140
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I-80 Westbound Between Mileposts 139 & 140
