Road User Understanding of Bicycle Signal Faces on Traffic Signals (2020) / Chapter Skim
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Appendix B – Data Collection Protocol B-1
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NCHRP 20-07 TASK 420 TASK 2 BIKE SIGNAL DATA COLLECTION Version March 23, 2019 This document describes the data collection procedure for gathering information pertaining to bicycle signals. For the intersections where the Google Streetview images are available, the following data elements described below and highlighted in blue need to collected.
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7. Intersection Cross Street: Name of the Cross street at the intersection where the bicycle signal is located.
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4. Number of Bicycle Signal Heads per Approach: Use Google Streetview to observe the number of bicycle signal heads for each approach.
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5. Number of Vehicular Signal Heads per Approach: For each approach that has bike signals, note the number of vehicular signals on that same approach.
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Visibility distance N Location of the bicycle signal face Stop bar location for bicycles 8. Lane Type for Bicycle Traffic: Note the bicycle lane type for the approach.
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10. Direction of Motor Vehicle Traffic: Select if the motor vehicle traffic on the approach is one way or two-way.
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-1TR Bike Lane -2L Bike 1R Lane -1TL B-8
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SIGNAL FACE DATA Next for each signal face on each approach, record the following data elements. The signal face data should be recorded directly below the approach data, in the same column.
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4. Are Arrows used in Bicycle Signal Face?
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6. Placement - Left, Center or Right of Bicycle Lane: Note if the bike signal face is placed left or right of the bicycle lane.
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7. Placement -Over Roadway or Sidewalk Path: Note if the bike signal is placed over roadway (OR)
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8. Does the bicycle signal have a back plate?
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No, since bicycle signal heads are the same color as vehicle heads.
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No sign is present 11. Presence of louvers or visibility restricting device on bicycle signal face: Louvers are used on bicycle signals to prevent motorists from seeing the bicycle specific signal indications from other lanes.
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12. Lens diameter: Estimate the diameter of the lens for each bicycle signal.
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C B A To obtain these measurements, open the saved image(s) of the intersection in ImageJ.
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This dimension was measured as the reference dimension. 16.96 feet Open Image J
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Now, use the drawing tool to draw a rectangle so that the top of the rectangle will be used to measure the vertical offset between signal faces. Then, navigate to Analyze->Tools->Scale Bar.
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