When I was driving from the 1960's to 2011 I always idled when needed. A/C when it was hot and heat when cold. I didn't care about anti-idle laws that made no sense even if originally designed for clean air. When you are allowed to idle your truck to keep a dog or cat safe and comfortable and called humane but a driver can sweat or freeze then forget it. Tell a politician or police officer to not run his or her A/C or heater and see the response.
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Fair enough.
HOS:
Hours Of Service
HOS refers to the logbook hours of service regulations.