NetLogo - What is 1 distance unit in NetLogo?

I am working on traffic simulations using NetLogo for a post graduate project.

For turtles to move forward we can specify the number of units it can move e.g. fd 1, which would mean the turtle moves for开发者_如何学编程ward by 1. What is this 1 unit? Is it equal to 1 patch or equal to the size of the turtle?

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Each step is the same size as the patches.

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As Luis said, each step is the size of one patch, but remember that steps are not restricted to integers, eg. fd 0.7 is a valid command and will move a turtle forward seven tenths of the size of a patch.

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The patches represent a roadway (if you're discussing a traffic simulation model) and one scales patches in a model appropriately, e.g. 1 patch=25 m....etc.!