How does this work? Is there a specific legal principle in play? Certainly some laws cannot be broken; how do you decide?<p>Looks like these are called &quot;exemptions&quot; and narrowly scoped to specific codes, e.g., &quot;Exemption of Authorized Emergency Vehicles (California)&quot; <a href="https:&#x2F;&#x2F;www.dmv.ca.gov&#x2F;portal&#x2F;dmv&#x2F;detail&#x2F;pubs&#x2F;vctop&#x2F;vc&#x2F;d11&#x2F;c1&#x2F;a2&#x2F;21055" rel="nofollow">https:&#x2F;&#x2F;www.dmv.ca.gov&#x2F;portal&#x2F;dmv&#x2F;detail&#x2F;pubs&#x2F;vctop&#x2F;vc&#x2F;d11&#x2F;c...</a>