[rahimnathwani]

With perfect enforcement, the fine could be small enough (e.g. $2) to be insignificant for most of us (maybe I need to swerve around an animal once per year) but significant enough to deter persistent offenders (who would rack up $20 in fines per journey).

[yjhoney]

what about someone making $50 / day? Lets imagine you are making just enough to get by and now government wants to roll out an automatic way to take money from your account for minor infractions. How unhappy would you be?

Also on a side note: "...the fine could be small enough (e.g. $2) to be insignificant for most of us..." -> I once said something like that to someone and he pointed out that statements like that was very hurtful to hear, especially coming from someone who does not understand his financial struggles.