A command-line based tool to calculate/derive road curve parameters to model real-world road engineering and traffic safety guidelines.

• npm i to install the prerequisites

This program uses the standard equation (v^2 = 127r) used throughout the United States road engineering manuals that creates a relation between a road curve's radius (r) and the design speed limit (v) through the curve, given the road exhibits no cant (i.e. superelevation).

Given this equation, this program may be used in multiple ways depending on your intention:

1. Specify a radius (in meters), to calculate the proper speed limit (in km/h) for the curve.
2. Specify a velocity (in km/h), to calculate the minimum radius (in meters) for the curve.

As this program is tailored to users of the Cities:Skylines computer game, the output of this program displays the radius value in meters and in game-units (u, where 1u === 8 meters).

• Radius: --radius
• Velocity: --velocity

node index.js [parameter=value]

The latest version is 1.0.0, and was released on 7 January 2022.

This program is Copyright © 2022 Alden Gillespy, and provided under the Creative Commons Attribution-NoCommercial-NoDerivatives International 4.0 (CC-BY-NC-ND 4.0) License.

In summary: You are free to download and use this program in accordance with the terms outlaid in that license and applicable law.