Ok, you can call me ridiculous.
But, When I make PCB's, I learned myself to get into a habit into making thick PCB traces for every wire including those that others would use maybe a 5 - 8mil width.
I also noticed that thicker traces allow me to use a junky printer to print the artwork to create decent PCB's with the photoresist method. With thin tracks, the printer sometimes prints a hole the size of the trace itself (5-8 mils). and No, I don't always have the time to use the office store for printouts.
Currently my minimums I set for my boards are 12mil width for traces with 12mil clearance. For power (except ground), I aim for at least 40 or 50mils to cover the width of a standard IC pad. For ground, I use 24mil max so it fits in-between pins.
Most of my circuits are powered with 5VDC but I have some powered with 3VDC and I also have part of my circuit that outputs loud audio as well as a radio module.
I used a 7805 voltage regulator without issues, so I can conclude my entire circuit uses less than 1.5A current total.
So my question then is, am I going overkill with my large trace widths? If so, what should I use as absolute maximums for trace widths and why?
and yes, I will use a ground plane, and all my PCB's are single-sided.
I should mention that the maximum speed passing through the majorit of my board at any one time is 24Mhz courtesy of a crystal, however those two traces (where crystal connects to micro) are less than 1/2 inch long and roughly 40 mils wide with a max of two 45 degree bends.