Any person, firm or corporation doing work regulated under this part
shall exhibit his, her or its license upon request to any peace officer,
Town Board member, member of the Board of Plumbing and Drainage Examiners,
member of the Board of Electrician Examiners, Code Enforcement Officer,
Plumbing or Building Inspector or their representative and shall,
while opening any highway for purposes incidental to such work and
while such highway is so opened, exhibit in a conspicuous place adjacent
to such opening a sign, at least one foot square, plainly marked showing
the number of such license.