Also to avoid doorings, bicyclists are advised to exercise vigilance, scan for the presence or likelihood of an occupied parked or stopped vehicle. Risk is increased especially in areas and at times of high parking turnover, on main arteries, during morning and evening commutes, and in retail, restaurant and entertainment districts with parallel parking. Bicyclists are also advised to assure their visibility to motorists & in mirrors both day and night by the use of bright and reflective clothing, vests, reflectors and front lights. Marked caution, slow speed and preparedness to brake when in the door zone are also counselled.