why we replace power track with polygon in lesson 8?

[Nareg]

Hello Robert
I have two questions in lesson 8, I want to know the reason of 1- when we want to improve the PCB, why we replace power track with polygon? 2-why we must make space as big as possible between tracks?
thank you very much

[robertferanec]

Nareg,

1) For powers I prefer polygons as currents may find the optimal path to flow. By using tracks I would be forcing the currents to follow certain path.
2) The biggest reason is crosstalk. This may help you: TIP #001: You can have crosstalk even on a board running at a low frequency

[MuhammedHesham]

Honestly.. i place polygon because it decrease the time of CNC Machine so that it doesn't cost me alot .... our markets in egypt are greedy and for onther reasons that included above ^^^^^^^ and for appeareance..