Not Ranked
No---Not all states have that policy
Traffic rules and road usage vary from place to place and a lot depends on how much traffic and how many lanes---seems that the PA and Az guys play to a different tune--who determines who sets the pace????
The interstate highway system was designed and built to move traffic----the EXPRESSWAYS/FREEWAYS are urban multilane/limited access roads with lots of merging about every mile or so ---the interstates have several miles between entrane/exits and hundreds of trucks moving interstate---they sometimes have lower speed limits and are to keep right except when passing---the auto traffic is generally in the left lanes and sometimes middle if it is 3 lanes wide---
TRhere is a site that breaks down the traffic guide lines for all the states and groups them into the few customary traffic patterns that are generally accepted .
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