ALBANY — Curtailing the state Ethics Commission’s broad interpretation of lobbying restrictions on public employees, a Supreme Court justice on Monday overturned the $1,000 fine the panel imposed on a laborer who worked on a state highway project after leaving his state job as traffic light repairman.

The commission’s enforcement of “revolving door” provisions in the Ethics Law has survived a series of challenges by high-level officials and professionals, including lawyers and engineers, who are barred from appearing before their former agencies for two years after they leave state service.