As they are often limited in speed and stopping capabilities due to their large size, large vehicles (vans, 18-wheelers, etc) should be forced to stay in the right lanes on interstates and highways.
While it not only contributes to traffic that interferes with emergency responses (e.g. medical personell or cops), it is a safety hazard for them to limit their chances of using run-away lanes. They should be allowed to drive in the left lane to pass if need be, but should be required to get back over.
Would love to hear feedback and see if others share the same sentiment too!