1. Clustering Analysis

2. Final Results Scope Results I-210, EB and WB, postmile 25 - 36
AM peak ( am) and PM peak (3 - 8 pm)
January to May, 2014 (151 days)
Results
Cluster Type
WB AM
# of days
WB PM
EB AM
EB PM
Weekend/Holiday 50
Weekday
Regular 58 55 78 44
Incident * 38 41 19 53
Others 5 4
Total
151
* There are many other types of clusters: events, weather, etc. This analysis focuses on incidents for now.

3. Illustration
The table shows the final result of the clustering analysis for I-210.
The scope of the analysis is both directions of I-210 (within our corridor from postmile 25 to 36), both AM peak (5-10am) and PM peak (3-8pm).
The 151 days from January 2014 to May 2014 are grouped into four clusters: weekend/holiday, regular, incident, and others (typically lack of data).
Note that the clustering is different depending on the direction (WB/EB) and time (AM/PM).

4. Flow & speed vs. CHP (210WB, AM)
PeMS CHP
Total
Non-incident
Incident
W’nd/H’day
PeMS flow & speed
Regular 58 24 82 9 4 13
Others 5 1 6 50 72 29
151
Type
Number of days
Weekend/Holiday 50
Weekday
Regular 58
Incident 38
Others 5

5. Flow & speed vs. CHP (210WB, PM)
PeMS CHP
Total
Non-incident
Incident
W’nd/H’day
PeMS flow & speed
Regular 55 26 81 3 9 12
Others 5 8 50 63 38
151
Type
Number of days
Weekend/Holiday 50
Weekday
Regular 55
Incident 41
Others 5

6. Flow & speed vs. CHP (210EB, AM)
PeMS CHP
Total
Non-incident
Incident
W’nd/H’day
PeMS flow & speed
Regular 78 9 87 5 4
Others 1 50 14
151
Type
Number of days
Weekend/Holiday 50
Weekday
Regular 78
Incident 19
Others 4

7. Flow & speed vs. CHP (210EB, PM)
PeMS CHP
Total
Non-incident
Incident
W’nd/H’day
PeMS flow & speed
Regular 44 27 71 8 13 21
Others 4 5 9 50 56 45
151
Type
Number of days
Weekend/Holiday 50
Weekday
Regular 44
Incident 53
Others 4

8. Incident Frequency (# of incidents per day reported by CHP among incident days)
These graphs show the incident frequency (in incident per day) on the dates clustered as “incident days”.
Note that incidents refer to those reported by CHP through PeMS. So 0 incidents per day means we have evidence that incidents occur on these days, but CHP did not report anything.
Note that the dominant situation for each direction (WB/EB) and time (AM/PM) is when there is only 1 incident per day.

9. Incident Severity (all incidents)
The graph here shows the joint distribution of closure duration (in minutes) and number of mainline lanes closed.
When the number of mainline lanes closed is 0, this means closure occurs on the ramp.
Note that the most dominant situation is when 1 lane is closed for around 30 minutes.
* Number of mainline lanes closed = 0
means lane closure occurs on the ramp

10. Incident Severity (WB incidents)
* Number of mainline lanes closed = 0
means lane closure occurs on the ramp

11. Incident Severity (EB incidents)
* Number of mainline lanes closed = 0
means lane closure occurs on the ramp