I built a transit travel time map

In plain words

A transit travel time map application that visualizes how long it takes to reach different locations via public transportation. Built for people searching for housing or analyzing transit accessibility in cities like Toronto, the tool uses GTFS transit data and a breadth-first search algorithm to calculate travel times, then displays results on an interactive map where road segments are color-coded by transit duration. The backend runs on Rust while the frontend uses React and Mapbox GL.

written from the facts on this page · September 2026

From the sources

Discover more about Henryn Xyz.

In the maker’s words, at launch

This was something I built while trying to look for housing in Toronto that was decently transit-accessible to my office while still cheap. The backend is written in Rust. It parses public GTFS data from transit agencies and performs a simple heuristics-based BFS on the bus lines to calculate how long to reach all…

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