&gt; Aim for a hard speed limit (maybe the actual speed limit).<p>That&#x27;s not gonna work. Depends on the day, the time, the weather, rain, fog etc. Some days, traffic flows at 70 on 405 during rush hour. If you go the legal speed limit you will be the dangerous blockage that makes everyone else down, and makes a few people unnecessarily grumpy. Other days it&#x27;s misty because the water on the road gets stirred up by all the trucks. It&#x27;s impossible to go the speed limit on these days, the flow is going 45.<p>There is no hard rule, except: go with the flow. SEE the traffic. BE the traffic. Do not FIGHT the traffic.