New · Road Finder
Find your next
great road.
Every driver knows the feeling of stumbling onto a perfect stretch of tarmac. The Road Finder does the hunting for you — scanning the map and scoring every road by how curvy and flowing it is, so the great ones light up. Hairpins, ridgelines, rhythm sections — if there's a touge out there, it glows red.
Tail of the Dragon
Length
11.0 mi
Curvature
1,253°/mi
Avg grade
5.2%
Ascent
1,240 ft
How it works
Three taps to a great drive.
01
Scan an area
Pan and zoom anywhere. The finder scans OpenStreetMap automatically as you move — no searching, no setup.
02
Every road, scored
Each road is graded 0–100 on curvature (peak technicality) and flow (sustained, rhythmic corners), then color-ranked from mellow to spicy.
03
Save the best ones
Tap a road for its grade, length, elevation, and twistiness — then save it as a route or build an event around it.
The score
Curvature + Flow, out of 100.
We sum the turning between every point of a road and slide a ~400m window to find its most technical stretch — that's the Curvaturescore. Then we measure how sustained the corners are across the whole road — that's Flow. Add them up and you get a single number that tells you, at a glance, whether a road is worth the detour.
Peak technicality
Sustained, rhythmic corners
tōge
“mountain pass”
The culture
Built for touge hunting.
Touge — the Japanese mountain passes that made hairpins famous — is exactly what this engine is tuned for. The Curvature score finds the switchbacks; Flow finds the rhythm sections that link them. Hakone, the Dragon, or the unnamed pass twenty minutes from your house — a great road is a great road, whatever continent it's on.
It knows the legends
From the Dragon to the touge.
- 100Tail of the DragonNC / TN · US-129
- 97IrohazakaNikkō, Japan · 48 hairpins
- 94Angeles Crest HwyCalifornia · SR-2
- 92Hakone TurnpikeKanagawa, Japan
- 89Mt Lemmon HighwayArizona
- 86Blue Ridge ParkwayNC / VA
Scores are illustrative — run the finder to grade the roads near you.
Every region has a touge.
Sign in and start scanning — yours is probably closer than you think.