| 1 | In this Tuesday, Aug. 18, 2015, photo, a man headed into Mexico stops at a fountain as fellow travelers approach the entrance to the Mexico border crossing in San Ysidro, Calif. |
| 2 | Starting late Wednesday, Aug. 19, pedestrians going to Tijuana from San Diego at the San Ysidro crossing must choose between a line for Mexicans who get waved through, and a line for foreigners. |
| 3 | Foreigners must show a passport, fill out a form and - if staying more than a week - pay for a six-month permit. |
| 4 | SAN DIEGO (AP) - Walking into Mexico at the nation's busiest border crossing with the United States is no longer an uninterrupted stroll for foreigners. |
| 5 | Starting late Wednesday, pedestrians going to Tijuana from San Diego at the San Ysidro crossing must choose between a line for Mexicans who get waved through, and a line for foreigners who must show a passport, fill out a form and - if staying more than a week - pay 322 pesos, or roughly $20, for a six-month permit. |
| 6 | About a dozen foreigners stood in line Wednesday night, directed by English-speaking agents to six inspection booths where they got passports stamped. |
| 7 | It took about 10 minutes from start to finish. |
| 8 | Travelers have long followed similar protocol at Mexican airports, but the new border procedure marks a big change at land crossings that weren't designed to question everyone. |
| 9 | Pedestrians and motorists have generally entered Mexico unencumbered along the 1,954-mile border with the United States. |
| 10 | "This is about putting our house in order," said Rodulfo Figueroa, Mexico's top immigration official in Baja California state, which includes Tijuana. |
| 11 | The changes, which have been in the works for years, come as Donald Trump has surged to the top of the Republican field in the U.S. presidential race. |
| 12 | He has insisted that Mexico sends criminals to the U.S. and pledges to build a border wall at Mexico's expense. |
| 13 | For Mexico, it is a step toward closing an escape route for American criminals who disappear in Mexico. |
| 14 | Border inspectors will tap into international criminal databases. |
| 15 | Motorists will see no change, and if lines get too long, officials will also wave pedestrians through. |
| 16 | More than 120 Americans expelled from Mexico this year while living in Baja California had arrest warrants in the U.S., according to Figueroa, delegate of the National Migration Institute. |
| 17 | Some ordered to leave last year were on the FBI's most-wanted list. |
| 18 | But authorities say benefits extend beyond stopping unwanted visitors. |
| 19 | A recent hurricane stranded twice as many Americans in Cabo San Lucas than U.S. authorities thought were there, Figueroa said, and registering as a foreigner would have made it easier to identify those who needed help. |
| 20 | Figueroa said Mexico can initially process about 1,000 foreigners daily, up from about 50 currently. |
| 21 | "If the line becomes clogged up, we will just let everybody through," Figueroa said. |
| 22 | "If we can't check everybody, we won't." |
| 23 | Figueroa said San Ysidro is believed to be the first U.S. land crossing to have a separate line for foreigners to show passports and that it will serve as a model for others as they are upgraded. |
| 24 | Aurora Vega, a spokeswoman for the National Migration Institute, referred questions to other departments. |
| 25 | Officials at the Foreign Relations Department and Mexican Embassy in Washington had no immediate comment. |
| 26 | About 25,000 pedestrians (and 50,000 motorists) cross daily at San Ysidro to work, shop and play but it is unclear how many are foreigners in Mexico. |
| 27 | U.S. Customs and Border Protection says about one-third entering San Diego are U.S. citizens, one-third are U.S. legal residents and the rest are from other countries, largely Mexico. |
| 28 | An unknown number have dual citizenship or residency in the U.S. and Mexico. |
| 29 | Both countries have long wrestled with logistical hurdles of stopping people going to Mexico by land. |
| 30 | The U.S. occasionally stops motorists and pedestrians as they leave - mainly to check for guns and cash - but it doesn't have a system to record exits like at airports, seen by many as a significant shortcoming in border security. |
| 31 | Previous efforts to question more foreigners entering Mexico met resistance in Tijuana, whose economy partly relies on Americans who visit restaurants, beaches, doctors and dentists. |
| 32 | Lines to enter the United States at San Ysidro have exceeded four hours. |