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How can I imagine a road system in software?

I am looking to model traffic as a side project, but I am having problems with ideas on how I should represent the road. I like the idea of ​​using a series of waypoints (straight lines using lat / long coords), but with this method it seems difficult to imagine different lanes. I also looked at some other traffic modeling issues, and one of them mentions the use of a bitmap, but I am having problems deciding how it will allow me to easily assign real-world lengths to road segments and lane widths, etc. Does anyone have helpful hints or other ideas that would allow the car to exist at a certain point on the road and be able to switch lanes, etc.?

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I would start with a grid of related nodes. A node will be a change in the state of the road, for example, an intersection, a start or end lane, an extension of the road itself, etc. Either you make complex connections that store all the information (lanes in both directions: how many lanes in the direction? Lane, etc.) or you save one connection for each lane. To make sure that 2 connections on opposite sides of a node are connected to the same strip, you can use node-based lane identifiers.

Thus, you have a graph on which you can run calculations, and you have all the data to visualize the entire network.

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