These structures appear at building entrances, sidewalks, and public spaces.

• In the United States, yellow pipes that stick out of some sidewalks and building entrances may be bollards, posts designed to separate pedestrian areas from vehicle traffic and, in certain cases...
• The Federal Highway Administration (FHWA), which depends on the United States Department of Transportation (USDOT), recognizes the importance of installing these elements within a specific program to prevent injuries to...
• What are yellow pipes for, and why are they important Bollards are vertical yellow posts installed on sidewalks, building access points, and public spaces to delimit areas and control vehicle passage
• Why are they installed in front of buildings and entrances Bollards are placed at the entrances of some buildings in order to prevent vehicles from reaching a door, facade, or pedestrian circulation area