Item 5 - High Accident Location and Analysis Program
AGENDA --~PORT SUMMARY
TO: Honorable Mayor and Members of City Council
-,- FROM: James L. Bowersox, City Manager
INITIATED BY: John D, Fitch, Assistant City Manager~ ~
Mark S. Weston, Director of Engineering Service
Michae] H. Robinson, Traffic Engineer /ltw",-
DATE: October 17, 1995
SUBJEcr: High Accident Location and Analysis Program - Final Report
ABSTRAcr
In 1993, City Council reviewed the Hughes Heiss Management and Efficiency Study and
approved a number of actions which were recommended to improve safety within the City.
Since that time, the City has undertaken numerous actions including traffic safety
studies by outside agencies, and completed grant projects to provide additional
facilities and equipment. The latest project to be completed was the High Accident
Location and Analysis Program, The program combined a Geographic Information System
(GIS) with an accident database to create a state-of-the-art system capable of
recording accidents, traffic volumes, answering queries, and printing accident
diagrams, In minutes, the system can analyze conditions normally requiring numerous
manhours, and will allow the City to be more proactive in its approach to improving an
a 1 ready excell ent traffi csafety record.
- ENVIRONMENTAL REVIEW
This action is not subject to CEQA review.
FISCAL IMPACf
It is expected that significant, but indeterminable savings will result from the
enhanced traffic safety provided by the High Accident Location and Analysis Project,
ADDITIONAL PUBLIC NOTIFICATION AND CORRESPONDENCE
None
RECOMMENDATION
It is recommended that City Council receive and file this report,
ACTION
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1 OF 16 DCT 1 7 1995 ITEM 5
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~ AG ENDA REPOR'!
CITY OF POW A Y
TO: Honorable Mayor and Members of City Council
FROM: James L, Bowersox, City Manager
INITIATED BY: John D, Fitch, Assistant City Manager1'\ ~
-"Mark S. Weston, Director of Engineering Service~
Michael H, Robinson, Traffic Engineer~~
DATE: October 17, 1995
SUBJECT: High Accident Location and Analysis Program - Final Report
BackGround
Early in 1993, City Council reviewed the Hughes Heiss Management and
Efficiency Study and approved a number of actions which were recommended to
improve operations within the City. One of the recommendations was that the
City should enhance our traffic safety program in several areas, Since that
time, the Engineering Services Department has initiated a number of actions
intended to achieve that goal. It should be noted that nearly 100% of the
projects described below were completed with grant funding.
Findinas
In mid 1993, a Traffic Safety Evaluation was prepared for Poway, The
evaluation was funded by the State and conducted through the University of
California Institute of Transportation Studies. It concluded that almost all
City operations affecting traffic safety met State standards, or was superior
to other similar sized cities. In late 1993 and early 1994, Engineering
. Services, in concert with the Safety Services Department, applied for and
received California Office of Traffic Safety grant funding for several traffic
safety projects, The first project involved acquisition of a Roadside Sobriety
Checkpoint Trailer and implementation of a Sobriety Checkpoint program, Next,
a Radar Speed Trailer was purchased for deployment in areas of the City
suspected of having speeding problems, Both programs were highly visible,
receive positive feedback from the community, and help improve traffic safety,
As a result of these and other programs, the City of Poway became the first in
the state to receive recognition as a Traffic Safety City.
Along with the above noted projects, the City applied for grant funding to
replace its aging and labor intensive manual accident records system with a
computerized accident database and analysis package, The High Accident
Location and Analysis Program was approved by the California Office of Traffic
Safety at approximately the same time as the other grants, The goals of the
project were: I) to develop an easy to use and maintain accident database and
ACTION: I
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2 OF 16
High Accident Location and An8iysis Program - Fin" Report
City Council Agenda. October 17. , 995
Pago 2
analysis system; 2} to identify at least ten intersections or mid-block
segments with correctable accident patterns; and, 3) to develop improvement
recommendations to enhance traffic safety at each location,
The database and analysis system was developed on a Pentium run PC by
combining electronlc mapping software with a database system capable of
storing and retrieving accident records, The combination of the two programs
created a powerful traffic safety analysis tool that few other cities in the
country have, Detailed accident reviews which once could take days to perform
can now be completed in minutes,
The mapping software is a state-of-the-art 'ArcView' Geographic Information
System (GIS) package containing a color map of Poway and portions of the
surrounding area. The map can be modified to include many forms of data, such
as parcels, utility lines, streets, and even zoning, It can be manipulated in
a number of ways to increase or decrease the area being viewed, The GIS
package is also capable of storing information relative to each item on the
map, such as area of each parcel, length of street segments, and size of
util ity 1 ines,
The accident database software is the most comprehensive accident database
program available. The software provides many types of queries and reports,
Several examples follow: "High incidence locations" allow for the
identification of any number of locations, both intersection and mid-block
segments, ranked by accident frequency or rate, "Intersection Historical
Queries" provides a collision history report for any selected intersection.
"Mid block Historical Queries" generate a report of collisions for any
selected mid block segment, Finally, "General Queries" provide accident
history reports based on anyone or combination of factors. As an example,
~sing this query, one can isolate all nighttime accidents, all rainy weather
accidents, all accidents involving drunk drivers, all accidents occurring
within speCific times, all accidents involving pedestrians or bicycles, or any
combination of the above, In addition to its reporting capabilities, the
software is capable of printing accident diagrams and keeps a record of
traffic volumes on most streets,
As part of the grant project, the system was queried for the ten intersections
and segments having the highest rates for the years 1993 and 1994, Summaries
of the intersections with the highest total number of accidents and those with
the highest accident rates for the years 1993 and 1994 are provided in
Attachment A, The highest total number of accidents was 12 during 1993 at the
intersection of Pomerado Road and Twin Peaks Road, The highest accident rate
for the same two year period was ,72 accidents per million vehicles at the
intersection of Pomerado Road and Oak Knoll Road, This intersection was found
to be only slightly above the state average rate of ,63 accidents per million
vehicles. All other intersections are below the state average. This indicates
Poway has a superior safety record at intersections,
Summaries of the mid-block segments with the highest total number of accidents
and those with the highest accident rates for the years 1993 and 1994 are
provided in Attachment B, The highest total number of accidents during 1993
was 12 on Poway Road between Bowron Road and Community Road,
In general, the types of accidents found in the review were minor and not the
kind that are correctable by the more common safety measures such as higher
levels of traffic control, changes in intersection geometry, or improved
3 OF 16 VeT 1 7 1995 ITEM .5 .'
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High Accident Location end A".v-ie Progrem . Final Report
City Council Agenda - October 17. 1995
Pogo 3
signing. Simple changes in signing and signal timing were proposed to be
implemented, Accident diagrams for the top two intersections are included as
Attachment C,
When compared to typical rates for roadways statewide with similar traffic
conditions, Poway's accident record is excellent, last year, for the third
straight year, Poway's safety record was better than 90% of similar sized
cities, and better than 85% of all cities in California, However, with
increasing traffic volumes and changing roadway conditions, new problems can
develop, It is anticipated that the Accident location and Analysis Program
will assist in Quickly identifying accident trends so that solutions can be
found before unsafe conditions develop.
Environmental Review
The actions covered in this report are not subject to CEQA review,
Fisca 1 I_Dact
It is expected that significant, but indeterminable, savings will result from
the enhanced traffic safety provided by the High Accident location and
Analysis Project.
Public Notification and CorresDondence
None
RecOlllllendation
-It is recommended that City Council receive and file this report,
JlB:JDF:MSW:MHR:pc
Attachments: A - High Incidence Intersection Report
B - High Incidence Midblock Report
C - Accident diagrams
4 OF 16 I)CT 17 1995 ITEM .5 "
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High Incidence Intersection Report
1/30/95
Number of collisions for the top 10 locations
From 1/1/93To 12131/93
Rank Intel'Hction Total Collisions
1 CAmino Del Nolte I ~8do RcHld- Twin Pea'" Road 12
2 Community RcHld I POW8)' Road a
3 Midland RcHld I Pow8)' RcHld a
4 Pomer8do RcHld I Pow8)' RcHld a
5 Carriage RcHld I POW8)' RcHld 5
a Ninth Street I ~8do Road 5
7 Oak Knoll Road I PomenIdo RcHld 5
a Pomer8do Road I T8d Williams Parkway 5
II POW8)' Road I Tarucan Drive 5
10 Bowron RcHld I POW8)' RcHld 4
10 Civic Center Drive I Community Road 4
10 POW8)' RcHld I Sr.e7 4
Settings Used For Query
Parameter Settin,
St8l1iDg Date 1/1193
Eading Date 12/31193
DiItaace from Iate..-tioa - !lO' for aoa rur-ead coUlsioas
- 1!lO' for rur-ead coUiJioas
neT 1 7 1995 ITEM.5 ~.
5 OF 16 ATTACI-I'1ENT A
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High Incidence Intersection Report
11301tS
Accident Rates for the top 10 locations
From 1/1/93To 12/31/93
Rank Intersection Ac:c:ident Rate Total Collisions
1 o. Knoll Road I PomerIIdo ROM! 0.718 5
2 Ninth StNet I Pomerlldo Road 0,832 5
3 Camino Del Norte I Pomerlldo ROM!-Twln Pulls Road 0.545 12
4 Civic Center DrlWl I Community Road 0.5011 4
5 Pomerlldo ROM! I Ted Williams Parkw~ 0.434 5
8 ContInue I Espola Road-Valle Verde ROM! 0,414 3
7 Community Road I Pow~ Road 0.314 8
8 Midland Road I Pow~ Road 0.383 8
e T!erra Bonita Road I Twin ....Ils Road 0.371 3
10 Pow~ Road I Tar_n Drtve 0.35lI 5
Settings Used For Query
Parameter Settinll
Startiag Date 1/1193
EDdlng Date 12/31193
DIJtuce from IDtenectioD <- !lO' for DOD relII'-cnd collillou
<- 1!lO' for relII'_d collillou
MlDbnUID NUlDber of Collillou 3
6 OF 16 ATTACHMENT A oeT 1 7 1995 ITEM .5 "
High Incidence Intersection Report
9/301M
Number of collisions for the top 10 locations
From 1/1/94 To 12/31/94
Rank Intersection Total Collisions
1 C.mlno Del Norta / Pomerllllo RMd- Twin ....ks RoIId a
2 Community RoIId / P_., RoIId .
3 P_., RMd / Silver uk. Drive 7
4 C.rr1ege RoIId / P_., RoIId .
5 Pomerllllo RoIId / Pow., RoIId 6
6 E.poI. RoIId / P_., RoIId 5
7 Midland RMd / P_., RoIId 5
a Pomerado RoIId / Scrippe P_.y P.rkw.y 5
9 Pomerllllo RoIId / Tad WIIII.me P.rkw., 5
10 Community RoIId / HI.llelIry PI_ 4
10 Pow., RoIId / T.r.....n Drive 4
.settings Used For Query
Parameter SettiD'
Stu1iDg D.te 1/1194
Ending D.te 12131194
Distance from Intenectlon <- 50' for DOn rear-end collilioDJ
<- 150' for rear-end collisioDJ
ITEM 5 ..
7 OF 16 ATTACK'1ENT A tlCT 1 7 1995
High Incidence Intersection Report
8/30/95
Accident Rates for the top 10 loc8t1ons
From 1/1194 To 12131194
Rank Intersection Accident Rate TotllI Collisions
1 Community RlHId I Hilleary PI_ 0.507 4
2 Pomerlldo RlHId I Scripp. P_ay Parkway 0.418 5
3 P_ay RlHId I Sliver Lake Drive 0.481 7
4 Eapola RlHId I Poway RlHId 0.487 5
5 Pomerlldo RlHId I Ted WIIII.me Parkway 0.434 5
6 Continue I Eapola RlHId-Valle Verde RlHId 0.414 3
7 Carriage RlHId I Poway RlHId 0.4011 6
8 Community RlHId I P_.y RlHId O,3a4 8
9 TIerre Bonita RlHId I Twin Peake RlHId 0.371 3
10 Camino Del Notte I Pomerlldo RlHId- Twin Peaka RlHId 0.383 8
Settings Used For Query
Parameter Settinl
Starting Date 1/1/94
EDdiDg Date 12/31194
DiJtuce from IDteneetioD <a SO' for BOD rear-ead colliJiou
<- ISO' for rear-ead colllsiou
MiDimum Number or ColliJiou 3
8 OF 16 ATTACI-I'1ENT A OCT 17 m5 ITEM .5 . ,
High Incidence Midblock Report
1/30"11
Number of collisions for the top 10 locations
From 1/1/93 To 12131/93
Rank Seament Total Collisions
1 Pow8Y Road - Bowron RO*! to Community Road 12
2 Pow8Y RO*! - Mlna De Oro RO*! to 5r-87 7
3 Poway Road - Carrlllll4l RO*! to Carrlllll4l Helglrta W8Y II
4 Community Road - Pow8Y Road to Private Road 4
5 Midland RO*! - Pow8Y Road to Private Road 4
II Pomeraclo Road - Pow8Y Road to Robl8Oll Boulevard 4
7 Pow8Y RO*! - Mlllarda RO*! to Eapola Road 4
8 Pow8Y Road - Pomerado Road to Oak Knoll RO*! 4
II Blue Crystal Trail - Pow8Y Road to Mural Trail 3
10 Community Road - Civic Center Drive to Dana Vista 3
10 Community Road - Metate Lane to Stowe Drive 3
10 POW8Y Road - Community Road to Midland Road 3
10 TwlR Peaka Road - 511Vt11'Ht 5tnlet to Wooda'eek RO*! 3
Settings Used For Query
Parameter SettiDI
Starting Date 1/1/93
EDdiDg Date 12/31/93
DiItanee from InteneetioD > SO' for DOD rear-end COIlilioDl
> 1!iO' for rear-end COIlilioDI
9 OF 16 ATTACI-MENT B 'OCTl 7 J995 ITEII ,5
High Incidence Midblock Report
912819S
Accident rates for ~ top 20 locations
From 1/1/93 To 12131/93
RInl! Seament Accident Rate Total Collisions
1 Midland Road - Hllle8ry P1-..Prlv.. Road to poway Road 7.n 5
2 Poway Road . Bowron Road to Community Road 3.79 12
3 Pomerado Road - Poway Road to Roblaon Boulevard 2.77 4
4 Community Road . Poway Road to Hille8ry P1_ 2.31 4
5 Poway Road - CarrllllI4l Road to Carrtllll4l Heights Way 2.1 5
8 Community Road . MetMa Lane to stowe Drive 1.25 3
7 Poway Ro8d. Mlna De Oro Road to Sr.e7 1.12 7
8 Poway Road - Community Road to Midland Road 1,04 3
1I Poway Road - PomerIICIo Road to Oak Knoll Road 1 4
10 Twin ....... Road - SIIverMt Street to Woodcreek Road 0.96 3
11 poway Road - Mlllarda Road to Eapola Road 0,83 4
12 poway Road - Blue Crysbll Trail to Prlv.. Road 0.41 3
Settings Used For Query
Parameter SettiDl!
Startin2 Date 1/1/93
EDdiD2 Date 11/31/93
DistaDce from IDtenectioll > SO' for _ rear-atd collisioDs
> 250' for rear-eod coIIisioDs
MinimDm NDJIlber 01 CoIIUioDs 3
ATTACHMENT B OCT 1 7 1995 ITEM .5 ,
10 OF 16
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- High Incidence Midblock Report
912ll19S
Accident rates for the top 20 locations
From 1/1194 To 12131194
~ Seament Accident Rate Total Collisions
1 TItan W~ - Rlpllrlan RoM! to Eden Grove-Eapola RoM! t.23 3
2 Community RoM! - Civic Center Drive to PowlIy RoM! 4,23 3
3 EspoIa Road - Range Pari< RoM! to P_~ RoM! 2.45 5
4 P_~ RoM! - Pomerado RoM! to Rldgedllle DrIw 2.28 7
5 PowlIy Road - Carriage Road to Silver Lake Drive 1.8 3
8 P_~ RoM! - Carriage HeIghts W~ to Qullle Court 1.52 3
7 Poway RoM! - Community RoM! to Midland RoM! 1.311 4
8 Pow~ Road - Pomeuldo RoM! to Oak Knoll RoM! 1 4
II P-.y RoM! - Bowron RoM! to Community RoM! Us 3
Settings Used For Query
Parameter SettiD2
StartiDl Dale 1/1/94
EDdhtl Date 12/31/94
DiJtaDce from IlltenectiOD > !l4)' for DOB rear-ead coI1iJioDs
> 2!lO' for rear-aad coIIUiou
l\fini_m NDlDber fII CoIIisiODs 3
DCT 1 7 '995 ITEM S . ,
11 OF 16 A TT ACI-MENT B
High Incidence Midblock Report
9/30/95
Number of collisions for the top 10 locations
From 1/1194 To 12131194
Rank Seament Total Collisions
1 Pow~ ROIId - P_8do Road to Rldgedale Drive 7
2 E.poIa ROIId - Range Park Road to P_~ Road 5
3 P_ay Road - Community Road to Midland Road ..
.. P_~ Road - Pomerado Road to Oak Knoll Road ..
5 Community ROIId - Civic Center Drive to P_~ Road 3
6 Community ROIId - Metate Lane to Stowe Drive 3
7 Old P_8do Road - PoIMrIIdo ROIId to Paaeo Colina 3
8 Pow~ ROIId - Bowron Road to Community Road 3
9 P_~ ROIId - Carriage Road to Silver Lake Drive 3
10 Pow~ Road - Ta~ Drive to Quate Court 3
10 Sroe7 - Poway Road to Ellie Lane 3
10 Titan W~ - R1parlllll Road to Eden Grove.&poIa Road 3
Settings Used For Query
Parameter SettiDI
StartiDg Date 1/1/94
EDdiIlg Date 12131/94
Diltuce from IDtenectloD > SO' for DOD rear-end COIUlloDl
> ZSO' for rear-end COIUlloDl
12 OF 16 ATTACHMENT B
OeTl 7 1995 ITEMS ......
Collision Diagram
Street: CAMINO DEL NORTE From: 1/1/93 To: 12/31/93
Cross Street: POMERADO ROAD-lWIN PE Date Prepared: 1 0/3/95
8/25J93 L1
~j
C <J----<Thim93
r;::
rIb
L
rIb
.L
: 6/16/93
~
~
;;;;;;f>" "l>- ......,
711 :J
1/4/93 :
ii12i9f>.' ..I>-
5/27193
I I
Number of Collisions Leaend L Right Turn !j; Pedestrian
~ Moving Vehicle t Left Turn OJ Fixed Object
10 Properly Damage Only -----.j Stopped Vehicle
~ Injury Collisions ~ Backing Vehicle :=: Sideswipe 0b Bicycle
Q Fatal Collisions ....-..... Ran Off Road '( DUI
12 Total Collisions ~..... Movement <I-- Day 0 Injury
Unknown -- Night C Fatal
13 OF 16 ATTACHMENT C OCT 1 7 1995 ITEM 5
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Collision Diagram
Street: CAMINO DEL NORTE From: 1/1/94 To: 12/31/94
Cross Street: POMERADO ROAD-TWIN PE Date Prepared: 10/3/95
~ L1
6/6/9, J::
~
~
1017""
t:,,~,
~1~ J -:J j)
I I
Number of Collisions Leaend L Right Turn 7:; Pedestrian
~ Moving Vehicle ,.- Left Turn ~ Fixed Object
~ Property Damage Only ------.j Stopped Vehicle
~ Injury Collisions ~ Backing Vehicle ::::= Sideswipe c3'o Bicycle
!l Fatal Collisions ..........,. Ran Off Road "( DUI
!! T olal Collisions ~ ----- Movement <r- Day 0 Injury
Unknown -- Night ell Fatal
14 OF 16 ATTACHMENT C OCT 1 7 1995 HeM 5
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Collision Diagram
Street: COMMUNITY ROAD From: 1/1/93 To: 12/31/93
Cross Street: POWAY ROAD Date Prepared: 1 0/3/95
"""'" Li
~l
<]-----<1--
3f7193
<l--
~
<]-- ---<I--
7/17/93
<]----~
1 3
21319~ ~
412119~
3i26i9f>.... C>
I I
NumberofCo"~ions LeQend L Right Turn * Pedestrian
.-- Moving Vehicle , Left: Turn OJ Fixed Object
Z Property Damage Only ---.j Stopped Vehicle
1 Injury Collisions ~ Backing Vehicle := Sideswipe 0b Bicycle
!! Fatal Collisions ~ Ran Off Road )' DUI
l! Total Collisions .... on __ Movement <l-- Day 0 Injury
Unknown --- Night ell Fatal
15 of 16 ATTACHMENT C OCT 1 7 1995 ncM 5
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Collision Diagram
Street: COMMUNITY ROAD From: 1/1/94 To: 12/31/94
Cross Street: POWAY ROAD Date Prepared: 10/3/95
~ II
~ ......--
2/5/94
1212OJ94
7;,d <)m'<I--
4/23/94
=1 1 !
8/9/94' 4112/94
1ii21'~
I r-
Number of Collisions Leaend L Right Turn 7; Pedestrian
~ Moving Vehicle , Left Turn LiJ Fixed Objecl
l! Properly Damage Only ~ Slopped Vehicle
~ Injury Collisions ~ Backing Vehicle ~ Sideswipe 0b Bicycle
() F alai Collisions ..-v- Ran Off Road y DUI
l! Total Collisions ....... Movemenl <:I-- Day 0 Injury
Unknown ___ Nighl @ Falal
16 OF 16 ATTACHMENT C ocr 1 7 1995 nEM 5
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