Presented by Saratoga City Staff

1. Traffic Safety Commission
Big Basin Way/4th Street
All-Way Stop
June 7, 2018

2. Outline
• Background
• Data Collection
• Field Observations
• Public Input
• Next Steps

3. Background
March 28,
2018
Installation
Stop
Warrant
Analysis
March 2017
TSC
Meeting

5. 330 AM; 290 P
250 AM; 400 P180 AM; 300 PM; 2,700 Daily
250 AM; 180 PM; 2,700 Daily
90 AM; 70 PM; 760 Daily 70 AM; 110 PM; 890 Daily
90 AM; 70 PM; 760 Daily 70 AM; 110 PM; 890 Dai

6. 330 AM; 290 P
250 AM; 400 P180 AM; 300 PM; 2,700 Daily
250 AM; 180 PM; 2,700 Daily
90 AM; 70 PM; 760 Daily 70 AM; 110 PM; 890 Daily
25 AM; 40 PM; 320 Daily 30 AM; 20 PM; 250 Daily
10 AM; 17 PM
10 AM; 15 PM
12 AM; 33 PM
14 AM; 48 PM

9. All-Way Stop Warrant Criterion
A. Collisions
1. 5 or more collisions in a 12 month period
B. Minimum Volumes
1. Major Street Vehicular Volume: 300 per hour for 8 hours, and
2. Minor Street Vehicular, Ped, Bike Volume:200 per hour for 8
hours
3. If 85th-percentile speed on Major Street exceeds 40 mph, then
70% of volume requirement (210 major street, 140 minor street)
4. No signal criterion is met, but all are satisfied at 80% (4
collisions, 240 major street, 160 minor street)
C. Other Criterion
1. Control Left-turns
2. Control vehicle/pedestrian conflicts in high pedestrian area
3. Locations where road user, after stopping, cannot see conflicting
traffic and is not able to negotiate the intersection unless
Background: Warrant

10. Background: Warrant

11. Installation: March 28th

12. Data Collection
Before
• March 20th to 27th
After
• April 18th to 22nd
• May 29th to June

13. Data Collection

14. Data Collection

15. Data Collection – Volume Trends
0
2000
4000
6000
8000
10000
12000
Before April May
Saturdays
Big Basin Way Pierce Road Oak Street 4th Street

16. Data Collection – Mountain Winery

17. Field Observations - Weekday

18. Field Observations - Weekend

19. Field Observations - Weekend

20. Field Observations – Mtn. Winery

21. Field Observations – Mtn. Winery

22. Field Observations
Peak Time Period
Overall
Operations
Average Queues Max Queues
Mid-Week
(evening peak)
Good 2 to 5 cars 8 cars
Friday
(evening peak)
OK 8 cars 20 cars
Weekend
(between 11am and 5pm)
Varies from OK
to congested
Varies 8 cars 20+ cars
Mountain Winery (45 min
to 15 min before start time)
Varies from OK
to congested 20+ cars 20+ cars

23. Congestion
84%
16%
Non-Congested Congested
Assumes:
- 1 hour each day Monday through
Thursday
- 1.5 hours on Fridays
- 6 hours each Saturday and Sunday
Congestion: Congestion extended
beyond 8 cars for more than 10 minutes
at a time.

24. Congestion Near Saratoga Ave

25. Congestion Near Saratoga Ave

26. Parallel Parking

27. Congestion Near Saratoga Ave

28. Public Input
Pros Cons
Addresses Sight Distance Concerns Can cause additional delays in Village,
especially on weekends
Controlled pedestrian crossing Bikes not comfortable riding between
parked cars and queued cars
Easier access from 4th Street

29. Next Steps
• One week summer data
• Evening peak period evaluation
• Make Determination