automated traffic and engineering surveys mike keller district 05 san luis obispo, california mike...

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

mike_keller@dot.ca.gov

(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

mike_keller@dot.ca.gov

(805) 549-3125

The Powerpoint presentation may be viewed on the Caltrans District 05 website.

Www.dot.ca.gov/dist05