Consulting Traffic Engineers to Government Agencies
December 15, 2025
Ms. Amber Shah, P.E.
Parks & Public Works Director/City Engineer
City of San Marino
2200 Huntington Drive
San Marino, CA 91108
Subject: Sight Distance Evaluation at the Residential Driveway at 1129 N. Granada Avenue, South of Huntington Drive
Dear Ms. Shah:
In response to a traffic evaluation requested by the City of San Marino, Hartzog & Crabill, Inc. (HCI) has prepared the following sight-distance evaluation for vehicular drivers exiting a residential driveway located along the west-side of Granada Avenue, at 1129 N. Granada Avenue. At this time, there are no existing on-street parking restrictions at/near this driveway.
COLLISION HISTORY:
HCI gathered the latest available collision history for the intersection of Granada Avenue and Roanoke Road (which is located south of the 1129 N.
Granada Avenue driveway location) from the State of California Highway Patrol (CHP) Statewide Integrated Traffic Records System (SWITRS), which is where local jurisdictions such as cities report their collisions. A comprehensive 5-year traffic collision history summary report was prepared to review collisions at/near the driveway location. Regarding sight-distance, such crashes to be reviewed include right-turn and left-turn type collisions, right-angle collisions (i.e., broadside or head-on) and pedestrian-vehicle collisions. Other collision types such as ‘rear-end’ and ‘hit object’ are generally not considered included, unless otherwise stated.
As you will see in the attached report (see Attachment A), there were a total of three (3) collisions reported at/near this intersection during the past five (5) years. One collision was a Head-On type due to improper turning and located south of the intersection. Another collision was as Broadside type at the intersection involving a bicyclist. The remaining collision was a Hit Object type near the intersection involving unsafe starting or backing.
None of these collisions were at the driveway to 1129 N. Granada Avenue.
TRAFFIC VOLUMES:
It is noted, the requested evaluation did not include the collection and evaluation of traffic volumes at this location. If the City may desire the evaluation of traffic volumes, upon request, HCI can order new traffic volume count data and include in the evaluation.
Gerald J. Stock, PE, TE,
Executive Vice President
17821 E. 17th Street
Suite 245
Tustin, CA 92780
Phone: (714) 731-9455
FAX: (714) 731-9498
www.hartzog-crabill.com
Ms. Amber Shah, P.E.
December 15, 2025
FIELD-REVIEW / SIGHT DISTANCE EVALUATION:
In regards to visibility for a driver exiting this residential Granada Avenue driveway, HCI performed a sight distance evaluation in the field at this location.
Granada Avenue has a posted speed limit of 30 MPH. In brief summary, the applicable driver sight distance was derived from the stopping sight distance guidelines found in the California MUTCD (see Attachment B). In this reference, a 30 MPH roadway speed recommends a minimum Stopping Sight Distance of 200 feet. However, it is likely that the overall speeds on this roadway may typically exceed the posted speed limit. Therefore, a 35 MPH speed limit was used as a more conservative measure, which has a minimum sight distance of 250 feet. An orange cone was placed at this distance from the driveway, and a photograph was taken from a stopped driver’s perspective (i.e., approximately 3.5 feet high) exiting the driveway and looking for oncoming traffic on Granada Avenue.
Table 1 below summarizes our findings based on the sight distance (visibility) of the orange cone placed at the applicable stopping sight distance.
TABLE 1
Intersection/Location Speed
Limit
(MPH)
‘Design’
Speed =
Speed
Limit
+ 5 MPH
(MPH)
California
Stopping Sight
Distance for
Design Speed
(feet)
Stopping
Sight
Distance
Satisfied?
(Yes or No)
Comments
Driveway on WestSide of Granada
Avenue, South of
Huntington Drive, at
1129 N. Granada
Avenue
30 35 250 Yes
When exiting the
driveway and looking
north, a driver does not
have a clear line-of
sight to the orange
cone located 250 feet
away, when there is
on-street parking north
of the driveway.
The City may consider
on-street parking
restrictions on the
north side of the
driveway to improve
visibility.
HCI prepared the attached Sight Distance exhibit (see Attachment C).
Ms. Amber Shah, P.E.
December 15, 2025
FIELD-REVIEW / SIGHT DISTANCE EVALUATION: (continued)
As shown, when looking in the northerly direction along Granada Avenue, an exiting driveway driver does not have a clear line-of-sight to traffic on Granada Avenue approaching from 250 feet away, when there are on-street parked vehicles north of the driveway. The curb just south of the driveway has a bulb-out into the street, in which on-street parking is likely not an issue.
Therefore, in order to improve visibility, restricting on-street parking approximately forty (40) feet on the north-side of the driveway along the west-side of Granada Avenue should be considered.
FINDINGS / CONCLUSION:
In regards to the nearby intersection collision history, there were a total of three (3) nearby collisions reported along Granada Avenue at/near the intersection with Roanoke Road. The collision information does not indicate that any pertain to the 1129 N.
Granada Avenue driveway.
In regards to sight distance, an exiting driveway driver does not have a clear line-of-sight looking north to traffic approaching from 250 feet away, when there are on-street parked vehicles near the driveway.
RECOMMENDATION:
In order to improve visibility, restricting on-street parking approximately forty (40) feet on the north-side of the driveway along the west-side at 1129 Granada Avenue is recommended. HCI prepared the attached Recommendations exhibit for the City’s consideration (see Attachment D).
We look forward to your review and acceptance of our findings, and to any additional services the City of San Marino may request. If you may have any questions or need further information, please feel free to call our office at (714) 731-9455. Thank you again for the opportunity to serve your community.
Sincerely,
Hartzog & Crabill, Inc.
Scott Ma, P.E., T.E.
Senior Engineer
Attachments: A. 5-Year SWITRS Intersection Collision History Report B. Stopping Sight Distance as a Function of Speed Table (California MUTCD) C. Field-Review/Sight Distance Photo Exhibit
D. Recommendations Exhibit
ATTACHMENT A
5-YEAR SWITRS COLLISION HISTORY
CITY OF SAN MARINO
INTERSECTION OF GRANADA AVENUE AND ROANOKE ROAD (RESIDENTIAL DRIVEWAY AT 1129 N. GRANADA AVENUE) 5-YEAR SWITRS COLLISION DATABASE
JAN. 1, 2020 - JUL. 31, 2025
CASE ID
COLL.
DATE
COLL.
TIME PRIMARY ROAD
SECONDARY
ROAD DIST. DIR. INTERS.
WEATH.
1 COLL.
SEVERITY
PRIM.
COLL.
FACT.
PCF
VIOL
CAT.
PCF
VIOL.
HIT
AND
RUN
TYPE
OF
COLL.
MOTOR
VEHICLE
INVOLVED
WITH
ROAD
SURF.
9403520 20211221 1000 GRANADA AV ROANOKE RD 84 S N A 3 A 8 22107 N A I A9416349 20220106 1400 GRANADA AV ROANOKE RD 0 Y A 3 A 9 21802 N D G A 84519144 20241212 1304 GRANADA AV ROANOKE RD 12 E N B 0 A 21 22106 N E I B NOTES:
Weather 1 Collision Severity Primary Collision Factor PCF Violation Category Hit and Run Type of CollisionA - Clear 1 - Fatal A - (Vehicle) Code Violation 01 - Driving or Bicycling Under Influence F - Felony A - Head-OnB - Cloudy 2 - Injury (Severe) B - Other Improper Driving 02 - Impeding Traffic M - Misdemeanor B - SideswipeC - Raining 3 - Injury (Other Visible) C - Other Than Driver 03 - Unsafe Speed N - Not Hit & Run C - Rear-EndD - Snowing 4 - Injury (Complaint of Pain) D - Unknown 04 - Following Too Closely D - BroadsideE - Fog 0 - PDO (Property Damage Only) E - Fell Asleep 05 - Wrong Side of Road E - Hit ObjectF - Other - - Not Stated 06 - Improper Passing F - OverturnedG - Wind 07 - Unsafe Lane Change G - Vehicle/Pedestrian - - Not Stated 08 - Improper Turning H - Other 09 - Automobile ROW - - Not Stated
Motor Vehicle Involved With: 10 - Pedestrian ROWA - Non-Collision 11 - Pedestrian Violation Road SurfaceB - Pedestrian 12 - Traffic Signals and Signs A - DryC - Other Motor Vehicle 13 - Hazardous Parking B - WetD - Motor Vehicle on Other Roadway 14 - Lights C - Snowy or IcyE - Parked Motor Vehicle 15 - Brakes D - Slippery F - Train 16 - Other Equipment - - Not StatedG - Bicycle 17 - Other Hazardous ViolationH - Animal 18 - Other Than Driver (or Ped)I - Fixed Object 19 - J - Other Object 20 - - - Not Stated 21 - Unsafe Starting or Backing 22 - Other Improper Driving23 - Pedestrian or "Other" Under the Influence24 - Fell Asleep00 - Unknown - - Not Stated
ATTACHMENT B
CA MUTCD GUIDELINES
FOR STOPPING SIGHT DISTANCE
California MUTCD 2014 Edition
(FHWA’s MUTCD 2009 Edition, including Revisions 1 & 2, as amended for use in California) Chapter 6C – Temporary Traffic Control Elements November 7, 2014 Part 6 – Temporary Traffic Control
____________________________________________________________________________________________ ____________________________________________________________________________________________
ATTACHMENT C
SIGHT DISTANCE PHOTO EXHIBIT
FIELD-REVEW EXHIBIT
GRANADA AVE (LOOKING NORTH) TOWARDS 1129 GRANADA AVENUE DRIVEWAY 1129 Granada Ave Driveway
GRANADA AVE (LOOKING SOUTH) TOWARDS 1129 GRANADA AVENUE DRIVEWAY 1129 Granada Ave Driveway
SIGHT DISTANCE EXHIBIT
(page 2 of 3)
1129 GRANADA AVENUE DRIVEWAY (LOOKING NORTH) ALONG GRANADA AVENUE - 1 Sight Distance = 250 feet
1129 GRANADA AVENUE DRIVEWAY (LOOKING NORTH) ALONG GRANADA AVENUE - 2 Sight Distance = 250 feet
SIGHT DISTANCE EXHIBIT
(page 3 of 3)
1129 GRANADA AVENUE DRIVEWAY (LOOKING SOUTH) ALONG GRANADA AVENUE - 1 Sight Distance = 250 feet
1129 GRANADA AVENUE DRIVEWAY (LOOKING SOUTH) ALONG GRANADA AVENUE - 2 Sight Distance = 250 feet
ATTACHMENT D
RECOMMENDED IMPROVEMENTS EXHIBIT
PROPOSED RED CURB INSTALLATION 1129 North Granada Avenue CITY OF SAN MARINO NW SE Not to Scale 1129 - 1133 DRIVEWAY *RANA'A A9EN8EINSTALL 40' RED CURB