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Thanks for that. So, basically, those thin traces are carrying low
voltage, low current signals, where the thicker traces tend to be higher
power carriers.

Mark
That is generally how it works and in this case, the power and ground traces
connected at the left and right sides of the edge connector are even thicker
than the thick signal traces which do not run between pins.

As an alternative to adding an inductor and/or resistor, sometimes power traces
have a deliberately thin section with decoupling at the ends to serve as a low
pass filter for controlling noise.