HID headlamp bulbs do not run on low-voltage DC current, so they require a ballast with either an internal or external ignitor. The ignitor is integrated into the bulb in D1 and D3 systems, and is either a separate unit or part of the ballast in D2 and D4 systems. The ballast controls the current to the bulb.
In the larger Montreal Census Metropolitan Area, 67.9% of the population speaks French at home, compared to 16.5% who speak English. Montreal is one of the most bilingual cities in Quebec and Canada with 56% of the population able to speak both English and French. Montreal is the second largest primarily French-speaking city in the world, after Paris. Montreal was named a UNESCO City of Design.
Montreal has over 600 kms of bike paths, bike bands and designated bike lanes that ring the island and bisect it from north to south (Christophe Coloumbe-Berri). The most popular of these are the paths along the historic Lachine Canal and through the Old Port of Montreal.