Before I start, I did search the forums and server rules for this and found nothing.
Suggestion: Excessive Traffic Law Breaking.
Description of rule: This rule will enforce that RP is upheld at all times, even when the server is low on population and/or no police are on. The rule will enforce all traffic laws are followed by players at anytime unless they have a valid RP reason such as being chase by attackers, police pursuit, etc.
Reason for this rule: As I am new to the server and have around 14 hours on the server, all I have seen that many players do not obey the traffic laws unless police are around. As a new player I see this as no one wants to RP or even be serious which can end up with new players leaving. Myself personally only notice that RP is present when interacting with others on the server.
Enforcing this rule: As admins who are active should be randomly checking players, this could be a duty they can also check upon. But also not leaving this to just admins but players can report as well.
Punishment (My Opinion): Now to have the most realistic RP server the punishment (not my decision) should go from a warning to a ban of 24 hours, then a 3 day ban and finally a perm ban.