U.S. Customs and Border Protection (“CBP”) reminds travelers that effective June 1, 2009, the Western Hemisphere Travel Initiative (“WHTI”) will go into effect at land and sea ports of entry, requiring travelers to present an approved travel document to enter the United States. The approved documents include a passport, a passport card, a NEXUS, SENTRI or FAST trusted traveler program card or a state- or province-issued enhanced driver’s license. Lawful permanent residents of the United States should present acceptable evidence of their lawful residence status when entering the country, such as a Permanent Resident Card (I-551). Travelers under age 16 need to present only a birth certificate or alternative proof of citizenship. The government is urging travelers not to wait until the last minute to obtain the required travel documentation. Travelers without appropriate documents after June 1 may face delays as CBP officers attempt to verify identity and citizenship.