The full form of Blvd is Boulevard. It’s used on Transport & Travel ,Roads & Highways in Worldwide

A boulevard (French, originally meaning bastion, abbreviated as bd in Metropolitan French, boul in Canadian French, and Blvd in English), is a type of large road, usually running through a city.
In modern American usage, it often means a wide, multi-lane arterial thoroughfare, often divided with a central median, and perhaps with roadways along each side designed as slow travel and parking lanes and for bicycle and pedestrian usage, often with an above-average quality of landscaping and scenery.