All-Way Stop at Jackson Avenue and
Magellan Street Intersection
October 1, 2024
Bob Moehling, Director of Public Works
Jeff Hitch, City Engineer
Brian Stephenson, Contract City Traffic Engineer
R e c e i v e d A f t e r A g e n d a P r i n t e d 1 0 / 1 / 2 0 2 4 - R e g u l a r M e e t i n g D I S C U S S I O N
P r e s e n t a t i o n - I t e m N o . 1 4
2 Jackson Avenue and Magellan Street
Residents Request:
• Install all-way stop signs or traffic
signal at this intersection
Residents Concern:
• High speed on Jackson Avenue
• Increased traffic volumes on
Jackson Avenue since the Ynez
Road connection in 2014
• Limited sight distance
• Potential for accidents
3 Jackson Avenue and Magellan Street
Background Info:
• Jackson Avenue is classified as a four-lane Major roadway with bike lanes per the City’s General Plan.
• Posted Speed limit 45 mph.
• Per resident requests, traffic signal and all-way stop warrants were studied in 2014, 2015, 2016 & 2018. Warrants for either control were not met. Sight distance was measured in the field and met the minimum City standards at the time.
• To increase visibility, Jackson Crossing HOA removed
overgrown vegetation within the sight corridor per City’s request in 2015/16.
• City installed “Intersection Ahead” signs in 2016 to warn drivers on Jackson Avenue of Magellan Street intersection ahead.
4 Jackson Avenue and Magellan Street
General Information:
To justify installing all-way stops or traffic signals:
• Warrants must be met based on national and state guidelines set forth in the California Manual on Uniform Traffic Control Devices (CA MUTCD).
• For all-way stops , the warrants include:
• Meeting minimum volumes, where the volume of traffic on the intersecting roads are approximately equal.
• Accident History/Crash Problem (5 or more in a 12- month period). • Sight Distance Constraints.
• Similarly, for traffic signals, some of these warrants include:
• Meeting minimum vehicular volumes for 8-hours, 4-hours, and peak-hour on an average day.
• Where there are heavy pedestrian volumes/crossing that encounter excessive delay.
• Accident History (5 or more in a 12- month period).
5 Jackson Avenue and Magellan Street
2024 Analysis:
• Residents requested a re-evaluation for a traffic signal or all-way stops.
• New data collected showed:
• 85th percentile speed of 46 mph NB and 54 mph SB.
• 15,580 vehicles per day (ADT).
• Overgrown vegetation and trees were observed
within the sightline that have not been maintained
and are now obstructing view.
• Sight distance measured was 403’, less than the
minimum required 495’.
• Traffic signal warrants were still not met.
• Per MUTCD criteria, an all-way stop warrant is now
met due to sight distance constraints.
Traffic Commission:
• On August 21, 2024, TC voted to recommend the
installation of all-way stop control.
6 Jackson Avenue and Magellan Street
7 All-Way Stop Simulation
8 Traffic Signal Simulation
9 Jackson Avenue and Magellan Street
Options:
1. Install All-Way Stop Control
a. Will add congestion
b. Cost: $10,000
2. Remove All Vegetation from Sight Distance Corridor
a. Property Ownership
b. Aesthetics
c. Cost
d. Future Maintenance
e. Other Community Concerns
3. Install Traffic Signal Control
a. Warrants
b. Cost
c. Congestion
4. Leave Existing Two-Way Stop Control As Is
a. Accident Risk
Staff Recommendation: Option 1
Questions
October 1, 2024
11 Jackson Avenue and Magellan Street