To utilize the features in otrp40.rar , you generally need to: Use a tool like WinRAR or 7-Zip .

Faster vehicles can pass slower ones (like trucks or buses) on two-lane roads.

Place the executable ( simutrans.exe ) and any included library files into your existing Simutrans installation folder.

If you're having trouble getting the traffic to use both lanes, would you like tips on how to to trigger the OTRP logic? Paksets - Simutrans

The core "informative" or defining feature of this file is the implementation of that allows vehicles to use multiple lanes effectively on a single road.

is a compressed archive containing a specific version of OTRP (One-way Two-way Road Patch) , a popular modification for the open-source transport simulation game Simutrans . Primary Informative Feature: Two-Lane Road Mechanics

The "40" in the filename typically refers to the release version (v40) of this specific patch set. How to Use the File