Route 4A

Baillou Hill / Robinson Road

Robinson Road / Baillou Hill Road / Bay Street

Unverified reference40% research confidence

This historical map has not been verified as a current bus route. Use it to help identify the streets, endpoints and service details that need checking.

Map data © OpenStreetMap contributors. Historical source pieces are preserved, including unresolved gaps.

DirectionUnknown

Historical starting pointCorner Baillou Hill road and Robinson Road

Service statusUnknown

Verification scopeNo ride verification has been published; this historical reference does not confirm current service.

Suggest an update

Research confidence

40%

Map closes clockwise, but its Market return differs from the conflicting official text.

A weighted assessment of the research supporting this unverified route reference. It is not a probability that a bus runs today, a service guarantee, or a measure of timetable accuracy.

Why this score?

Historical source clarity5 / 20
The source names a closed circuit but conflicts materially with the mapped return, and the proposed repairs leave two distinct downtown alternatives.
Mapped extent completeness15 / 20
The map contains a complete candidate circuit but omits the printed Frederick passage; it cannot represent all competing source interpretations.
Geometry consistency20 / 20
The saved candidate has one connected part, no recorded breaks or local direction conflicts, and a closed source-order traversal witness. Geometric closure does not choose the correct source alternative.
Recent direct field evidence0 / 20
No completed, reviewed ride record for this route is attached to the research baseline. Historical descriptions, map edits and unreviewed reports do not establish a currently observed full journey.
Independent field corroboration0 / 20
No accepted independent check corroborates a dated route-specific field record in this baseline. Reuse of the historical official description is not independent observation.

What still needs checking

Frederick-to-Mackey and Mackey-to-Robinson lack major connectors.
OSM uses direct Bay/Market, while a literal-Frederick repair uses Princess/Market; the two alternatives are not interchangeable.

Research reviewed 2026-09-10 · Assessment 2026-09-14

How you can help

Share the streets your bus uses from Bay Street toward Robinson Road. Tell us whether it passes Frederick, Market or Mackey Street.

Help check route 4A

Sources and scope

Robinson Road/Baillou Hill road/Cumberland Street/Navy Lion road/bay Street/Frederick Street/Mackey Street/Robinson Road/to corner Robinson and Baillou Hill Road.

Source links: Official route PDF - page 2
OSM route 4A
Official reference: Route PDF, page 2
Reference downloaded: 2026-09-10
Map last edited: 2023-06-02 (source map history, not service verification)
License: ODbL-1.0
Uncertainty: No ride verification has been published; this historical reference does not confirm current service.