This model
A link here is a model: the network, the seed, your assumption edits, your
changes to the geometry and signal timing, and the volume. It is not a recording of
the run you are watching. Pause, speed, step and camera never
reach the simulation, and a hold or a call from the signal table is a momentary
poke at a live controller, so neither travels.
The link is fixed at the last Regenerate. Move the volume slider and
the simulation responds immediately; the link does not change until you regenerate,
and then it carries what is on screen. Anything set and not yet regenerated is named
beside the button rather than dropped in silence.
Opening one runs the model from t = 0 at the volume it records. A network
you built yourself is rebuilt from OpenStreetMap in the recipient's browser, so they
see the corner as the map has it today rather than as a snapshot of the day the link
was made.
Free, today, for everyone
- Every network in the picker, at any demand, with the aerial backdrop
- Pedestrian delay, queues, approach delay, and the integrity readouts
- No account and no sign-in
What a paid tier would have to earn first
Charging for "modelling ability and analysis reporting" means charging for delay
and level-of-service figures, over a named intersection, with a PE's name on them.
Two calibration gates are still open — saturation flow and the free-flow speed
distribution — so those numbers are shaped correctly and sized arbitrarily.
A free surface may carry figures labelled uncalibrated. A paid one may not. So the
paid axis, when it arrives, is machinery rather than numbers: replication with
confidence bands, saved projects, export, larger areas.
There is no waitlist form yet, and no payment portal. Mail me instead.
What this is
A microscopic traffic simulator that runs entirely in your browser — car
following, gap acceptance, signal control and pedestrians, stepped ten times a
second. Nothing is uploaded, because there is nothing to upload to.
What it cannot tell you yet
Delay and level-of-service figures are uncalibrated. The model
reproduces the right shapes and the sizes are not yet pinned to observation:
saturation flow needs a signalised standing queue, which Braddock & Motor does not
have, and the free-flow speed fit is closed on that site's speeds only. Treat every
delay figure as a comparison between two runs of this model, never as a prediction
of a real one.
Three unmeasured behavioural assumptions move the pedestrian results by more than
the model does: the share of drivers who yield to somebody waiting at a kerb,
whether people cross 18 m in one stage or two, and the corner return radius. They
are reported as ranges rather than as numbers, and no before/after has been sealed.
Where the geometry comes from
Braddock & Motor is anchored on a Census reference point, its street centrelines
are fitted to OpenStreetMap, and its volumes are an October 2025 tube-and-camera
collection. The corner radii, turn ratios and yielding behaviour are not measured.
The aerial is context for the reader and nothing is measured off it.
Street geometry © OpenStreetMap contributors, ODbL. Imagery © Esri and its
partners, with a public-domain USGS fallback. Search © Esri and its data
partners — the geocoder finds the point, and every street name you see
after it is OpenStreetMap's.
Contact
The fastest way to reach us about a site is the
— it arrives with the coordinates, the geometry and the dates already on it.
Contact address to be set before launch.