Design Options to Reduce Conflicts Between Turning Motor Vehicles and Bicycles: Conduct of Research Report (2024)
Chapter: Appendix C: Desktop Data Collection Fields
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Suggested Citation:
"Appendix C: Desktop Data Collection Fields." National Academies of Sciences, Engineering, and Medicine. 2024. Design Options to Reduce Conflicts Between Turning Motor Vehicles and Bicycles: Conduct of Research Report. Washington, DC: The National Academies Press.
doi: 10.17226/28289.
Appendix C
Desktop Data Collection Fields
Table 1. Desktop data collection fields
| Field | Description | Data Coding Options |
|---|---|---|
| City | The city in which the intersection is located | |
| Number of legs | Number of segments converging on intersection | |
| Angle/skew | Is the intersection exclusively right angles or is there a skew? | 90-degree angle; near 90-degree angle; skew |
| Intersection Treatment for Bicycles | Selecting from list of treatment types | BL w/pocket to left of RTL; BL to right of shared thru/RTL; SBL to right of shared thru/RTL; BL/SBL with mixing zone; SBL w/offset/protected; BL to left of shared thru/LTL; SBL to left of shared thru/LTL; BL w/pocket to right of LTL (left side BL); BL crosses channelized turn lane |
| Bike Lane Marking through Intersection | Is there pavement marking / paint showing the bike lane path through the intersection? | None; Half-White Stripe; Half-Green (i.e., bike lane is green but ends within intersection); Full-White Stripe; Full-Green; Full-Hybrid (i.e., bike lane through intersection, but green paint ends halfway) |
| Lane type for bicycle traffic | Upstream of the intersection, what was the bike lane / facility? | Right-Side Bike Lane; Right-Side Separated Bike Lane; Shared Lane; Left-Side Bike Lane; Left-Side Separated Bike Lane |
| Direction of bicycle traffic | Is bike traffic one-way one side, one-way two sides, or two-way (e.g., a two-way cycle track)? | One-way one side; One-way two sides; Two-way |
| Approach leg direction | Direction of subject approach | N; S; E; W; NE; NW; SE; SW |
| Presence of Bicycle signal | Is there a bicycle signal for approaching bicycles (subject approach only) | Y/N |
| Presence of a bus stop | Is there a bus stop (bike lane side of street)? If so, is it on the near-side or far-side of the intersection? | None; Near-side; Far-side |
| Direction of motor vehicle traffic | Is motor vehicle traffic one-way or two-way | One-way; Two-way; NA |
| # of lanes in same direction | How many travel lanes, including bike lanes, on the approach at the intersection? |
Suggested Citation:
"Appendix C: Desktop Data Collection Fields." National Academies of Sciences, Engineering, and Medicine. 2024. Design Options to Reduce Conflicts Between Turning Motor Vehicles and Bicycles: Conduct of Research Report. Washington, DC: The National Academies Press.
doi: 10.17226/28289.
| Field | Description | Data Coding Options |
|---|---|---|
| Lane utilization for traffic in the same direction | From left to right, lane #, direction type (T=Through; R=Right; L=Left; BL=Bike Lane; SBL= Separated Bike Lane) | |
| Opposing left turn lane | Is there an oncoming left turn lane (i.e. wherein traffic would turn across a bike path through intersection)? | Y/N |
| If opposing left turn lane - Type of Left-Turn Signal Head | If there is an opposing left turn lane, is it signalized, and if so, what type of signal? | N/A (no opposing left turn lane); Exclusive Left-3-head Turn Arrow; Excl Left-4-head Turn Arrow; Exclusive Left 5-head turn arrow |
| Cross-street direction | Is the cross street two-way, One-way heading right, or One-way heading left? | Two-way; One-way heading right; One-way heading left |
| Cross-street # lanes (on approach) | How many approach lanes are there on the cross street (sum of both directions). | |
| Street View: Earliest date with CURRENT layout/space allocation | In the Google Street View time capsule, when is the earliest date with the current road space allocation (focusing on the approach bicycle facility)? | month year |
| Street View: Latest date prior to Current layout/space allocation | When was the prior time capsule? | month year |
| Offset descriptor | SBL w/offset/protected locations only – description of offset | 6’+; Less than 6’; No physical barrier N/A |
| Mixing zone marking descriptor | For mixing zone locations only – description of mixing zone marking | Has mixing zone marking; Minimal / borderline mixing zone marking; Lacks mixing zone marking; N/A |
| Pocket lane marking descriptor | For pocket lane locations only, are the turn lane and pocket lane marked and wide enough? | Turn lane has turn markings and adequate turn width; Has markings but is not wide enough; Wide enough but no marking; No marking and too narrow; Pocket not fully established; N/A |
| Curb tight | For bike lane locations only, is the bike lane along the curb tight? | BL is curb tight; BL not curb tight; N/A |
| Comment | Space to add comment if any fields require some clarification |
Suggested Citation:
"Appendix C: Desktop Data Collection Fields." National Academies of Sciences, Engineering, and Medicine. 2024. Design Options to Reduce Conflicts Between Turning Motor Vehicles and Bicycles: Conduct of Research Report. Washington, DC: The National Academies Press.
doi: 10.17226/28289.
Suggested Citation:
"Appendix C: Desktop Data Collection Fields." National Academies of Sciences, Engineering, and Medicine. 2024. Design Options to Reduce Conflicts Between Turning Motor Vehicles and Bicycles: Conduct of Research Report. Washington, DC: The National Academies Press.
doi: 10.17226/28289.
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