Belt laws increase belt use, especially with publicized enforcement.The strongest laws allow for primary enforcement, or for police to stop a driver solely for not using a seat belt. In states with secondary enforcement, police can only enforce the belt law if they have pulled over the driver for another violation first. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.