It sounds dangerous. I had a curious look at some parts on Digi-Key I don't think these numbers are outrageous for certain applications.
We can rearrange the equation from earlier if you're curious.
First: If it were me I would partner with another engineer and my supervisor to get support before trying this in a lab.
$$0.03 V \gt IR \nonumber
\\0.03 V \gt I { {\rho L} \over {A} } \nonumber
\\ \Leftrightarrow { {0.03 V} \over {I\rho} } \gt { {L} \over {A} } \nonumber
\\ \Leftrightarrow { {0.03 V} \over {I\rho} } \gt { {L} \over {Wt} } \nonumber
\\ \Leftrightarrow { {0.03 V t} \over {I\rho} } \gt { {L} \over {W} } \nonumber
\\ \Leftrightarrow { {0.03 V t \sigma} \over {I} } \gt { {L} \over {W} } \nonumber$$
I always forget the resistivity of copper, but its reciprocal is the conductivity, ##\sigma##, which is easier for me to remember.
$${ {L} \over {W} } \lt { {(0.03)(100)(2.8 \times 25.4 \times 10^{-6}) (5.8 \times 10^7)} \over {55} }$$
I'm getting about 225, which seems like it won't be hard meeting that particular spec; however: You may want to take a look at your temperature requirements (IPC 2152). I'm sure I'm also overly simplifying this and wouldn't doubt there's a mistake in my quick calculation, and I would guess there are many other important specs. Partner up with someone even if you're confident.
I haven't brought up arcing because I don't know much about it although I think there's something in IPC 2221B about it. There are calculators online... I don't know how reliable it is or aligned with the guidelines:
https://www.smps.us/pcbtracespacing.html