交通督導員的主要職責是(a)執行交通法例中有關停放車輛的規定，包括發出違例停放車輛定額罰款通知書；(b)履行《道路交通條例》委予的職責，包括管制和規管交通及執行其他相關職務；以及(c)執行《汽車引擎空轉(定額罰款)條例》委予的職務。
註：交通督導員屬文職人員，但須(a)遵守《交通督導員(紀律)規例》所訂明的紀律規定；以及(b)(i)穿着制服；(ii)輪班工作；(iii)在全港任何地方工作；以及(iv)完成為期4星期的訓練課程；如人員無法通過課程所規定的評核，可能會被終止服務。

A Traffic Warden is mainly deployed on (a) enforcement of the provisions of traffic legislation in relation to the parking of vehicles including the issue of fixed penalty parking tickets; (b) discharging functions conferred on them under Road Traffic Ordinance including controlling and regulating traffic and other related duties; and (c) performing duties conferred on them under Motor Vehicle Idling (Fixed Penalty) Ordinance.
Note : Traffic Wardens are civilian staff but are (a) subject to discipline under the Traffic Wardens (Discipline) Regulations; and (b) required to (i) wear uniform; (ii) work shifts; (iii) work in any place in the territory; and (iv) successfully complete a 4-week training course and those who fail to pass the requisite assessment of the course may have their service terminated.