JOLDA
Traffic Studio

Settings

Engineering defaults for new projects, viewport preferences and local storage.

Engineering units

Lane width
m
Speed
km/h
Yellow time
sec
All red
sec
Min green
sec

Applied to new projects and to the “Standard plan” and “All-red” actions in the phase editor. Metric units are used throughout: metres, km/h, veh/h, seconds.

Interface

Density

Applies to every page immediately. Use Large on a 1920×1080 display viewed from a distance, Compact on 1366×768 laptops.

Viewport

Show grid
Snap to grid
Grid size
Shadows
Scene labels

Performance

Vehicle quality
Vehicle cap
Autosave on change

Local storage

…
0 projects stored in this browser. Nothing leaves your machine — export a JSON file to back a project up.
Clearing site data in the browser removes every project. The demo intersection is recreated automatically on the next visit.

Keyboard shortcuts

Play / pauseSpace
Reset simulationR
Delete selected objectDelete
UndoCtrl + Z
RedoCtrl + Y
Save projectCtrl + S
Toggle gridG
Select toolV
Measure toolM
Top / 3D / Driver / Follow view1 / 2 / 3 / 4
Faster / slower+ / −
Clear selectionEsc

About

Jolda Traffic Studio — a browser-based intersection designer and fixed-time signal simulator. Vehicles follow the Intelligent Driver Model with give-way rules at conflict points; level of service uses HCM control-delay bands.

Built with Next.js, React Three Fiber, Zustand and Recharts. No server, no accounts.