Automated Traffic and Engineering Surveys
Mike Keller
District 05
San Luis Obispo, California
Mike Keller
District 05
San Luis Obispo, California
Purpose of a Survey
•To establish justifiable speed limits
•Enable Law Enforcement and the Court to site and convict flagrant offenders according to the California vehicle Code
Data Collection
• Speed Samples
Data Collection
• Speed Samples
•Laser vs. Microwave
Data Collection
• Speed Samples
• Laser vs. Microwave
• Old Calculation Method
Data Collection
• Speed Samples
• Laser vs. Microwave
• Old Calculation Method
• New Calculation Method
LASER SURVEY<SPEED CHECK AT CITY PARK><CLEAR AFTERNOON>
POSTED SPEED LIMIT: <35>
TIME FROM:<97/11/05 17:51> TO:<97/11/05 17:52> FILENAME: DEMO.A51TRAFFIC DIRECTION:<2-DIM.> MIN SPD ALLOWED <11> MAX SPD ALLOWED <100>
SPD #VEH. %ILE ABOVE THIS SPEED 16 - 17 0 100.00 17 - 18 2 98.00 18 - 19 4 94.00 19 - 20 0 94.00 20 - 21 4 90.00 21 - 22 2 88.00 22 - 23 2 86.00 23 - 24 0 86.00 24 - 25 3 83.00 25 - 26 0 83.00 38 - 39 0 23.00 39 - 40 4 19.00 40 - 41 5 14.00 41 - 42 2 12.00 42 - 43 4 8.00 43 - 44 3 5.00 44 - 45 2 3.00 45 - 46 0 3.00 46 - 47 2 1.00 47 - 48 1 0.00 48 - 49 0 0.00
TOTAL VEHICLES = 100 MINIMUM SPEED = 17 MAXIMUM SPEED = 47
AVERAGE SPEED = 31.13 50th PERCENTILE = 29.82 85th PERCENTILE = 40.60
TEN MILE PACE = 24 - 33 #VEHICLES IN PACE = 53 %VEHICLES IN PACE = 53.00
STANDARD DEVIATION = 9.38 %OVER LEGAL LIMIT = 31.00 END OF REPORT
Additional Benefit Of Software
• LINE GRAPH
• BAR CHART
LINE GRAPH
BAR CHART
TIME SAVING RECAP
Data Collection Time Savings
A ( 3 ) Mile Segment x ( 3 ) collection spots per Mile, = 9 locations.
Microwave Radar Laser Gun
9 locations x ( 2 ) location moves =18 x .5Hr = 9 Hrs 9 locations x .5 Hr = 4.5
9 HR’S X $40.00 = $360.00 4.5 HR’S X $40.00 = $180.00
Calculation Savings
Microwave Radar Laser Gun
9 locations x ( 2 ) sheets = 18 sheets Plug laptop into printer and print 9locations in .5 Hr.
18 sheets x .25 Hr = 4.5 Hr’s
4.5 x $40.00 = $180.00 .5 x $40.00 = $20.00
Total Cost Total Cost$360.00 $180.00$180.00 $ 20.00$540.00 $200.00
Strip Maps• Existing Construction
Strip Maps• Existing Construction• New Construction
Hand Delineated Strip Map
Aerial Photo Strip Map
Strip Maps• Existing Construction
• New Construction
Hand Delineated Strip Map
Aerial
•Storage & Shipping
Benefit & Cost Savings of Streamlining
Time & Labor• Collecting data• Calculating data• Eliminate vendors & middleman
Materials• Kronaflex Sheets• Blueline Sheets• Photo Negatives• Storage
Automated Traffic and Engineering Surveys
Mike Keller
Caltrans
District 05
50 Higuera Street
San Luis Obispo, California 93401
(805) 549-3125
The Powerpoint presentation may be viewed on the Caltrans District 05 website.
Www.dot.ca.gov/dist05
Mike Keller
Caltrans
District 05
50 Higuera Street
San Luis Obispo, California 93401
(805) 549-3125
The Powerpoint presentation may be viewed on the Caltrans District 05 website.
Www.dot.ca.gov/dist05