All violations of this code, or of any regulation or provision thereof, are punishable by a fine not less than $150 and not exceeding $350 or imprisonment for a period not to exceed six months, or both, for conviction of a first offense; for conviction of a second offense, both of which were committed within a period of five years, punishable by a fine not less than $350 nor more than $700 or imprisonment for a period not to exceed six months, or both; and, upon conviction for a third or subsequent offense, all of which were committed within a period of five years, punishable by a fine not less than $700 nor more than $1,000 or imprisonment for a period not to exceed six months, or both. Violations of this chapter or of such local law, ordinance or regulation shall be deemed misdemeanors, and for such purpose only, all provisions of law relating to misdemeanors shall apply to such violations.