Tools
Calculators
Every calculator here shows its full working, states its assumptions with citations, and distinguishes calculated results from adopted design values.
Sight distance
How far a driver must be able to see to stop, cross or pass safely.
Vertical alignment
Curve lengths, K values and profile elevations for crest and sag curves.
What comes next
The platform is built so a second calculator is mostly engineering logic and content rather than new infrastructure — units, provenance, formula rendering, diagrams, print output and shareable state are all shared.
Vertical curves, intersection sight distance, horizontal curves, superelevation and pavement calculations are the natural next steps. Rather than guess the order, we are letting search data and the feedback on the stopping sight distance calculator decide it. There are no placeholder pages here for tools that do not exist.