Mapweaver/Manual/Oneways

Adding oneway arrows is simple:

-oneways (add oneway arrows) 
-onewaycolor=TEXT (color for oneway arrows)
-onewaysize=INTEGER (size of arrows)

It is also possible to size the arrows automatically depending on the way size. Specify values X 0..100. -onewaysize is overridden then.

Arrowsize=waySize/100*X

-onewayautosize=INTEGER