The rule of thumb is to follow the traffic and be interactive.
On the service road (normall is 50 limit), if you are alone, you better drive 50 ~60. If a lot of cars are driving at 70~80, you should follow.
On 40 west island, if you want to drive on the far left lane, you have to be at 130~140, if you are at 120, there will be cars tracing you.
You can't expect others give the right of way to you, if you have the right of way, and other driver does not give it to you, give him/her a horn, that's it.
Driving is fun, enjoy!