The Idaho Stop law in short allows cyclists to treat a red light as a stop sign and a stop sign as a yield. This allows the cyclists to pass when it is safe and to be more visible to motorists. Ten states allow it as far back as 1982 with about 10 percent of the US population.
Some more links:
Current news and links to more here: https://usa.streetsblog.org/2022/10/20/fed-safety-administrator-lets-legalize-the-idaho-stop/
NHTA Fact sheet: