Part 1 of 2 parts 02/01 By DEBORAH HASTINGS Associated Press Writer SANTA CLARITA, Calif. (AP) -- Roger Basham doesn't understand all the fuss. After all, it has been at least three months since a car was impaled on the anti-terrorist device that guards his Hidden Valley housing tract. "I'm sure you have a lock on your front door," he says. "And I'm sure you wouldn't like people opening your door and walking through your house just because it's a quicker way to get home." Basham no doubt is right. But Hidden Valley's answer to interloping motorists is one of the most extreme measures taken by a growing number of fearful communities in this country. Faced with dangerous crime and unwanted traffic, American neighborhoods from California to Georgia are hiding behind walls, gates and barbed wire in a last-ditch effort to protect homes and families. In the nation's second largest city, the Los Angeles Department of Public Works is struggling with a deluge of applications from local neighborhoods that want to barricade public streets. Resurrecting medieval strategies for protecting hearth and home also has revived an age-old debate: Should the haves be allowed to wall themselves off from the have-nots? The answer depends on which side of the wall you call home. Those outside the walls call such structures elitist and divisive to communities. Those inside say not true, and that defending themselves is their God-given right. The rise of fortified communities in Los Angeles, New York, Detroit, Chicago and other cities is even the subject of an upcoming book titled "The New American Ghetto," by photographer and author Camilo Jose Vergara. In the case of Hidden Valley, the private, residential development 35 miles north of downtown Los Angeles became the world's first to purchase a $50,000 hydraulic bollard. Primarily used to protect embassies, airport runways and U.S. nuclear facilities, the device shoots two three-foot-long steel cylinders positioned below ground up into the cars of motorists who defy it. About 28 vehicles have been damaged since the bollard was installed last April. Its use sparked a local controversy and threatened lawsuits. Yet residents continue to defend the device, saying there are ample warning signs and that they are mandated by the county to keep traffic off their private road. In real estate-obsessed Southern California, gating subdivisions has become a way of life for developers. Not only does providing such measures promise greater safety, they also provide a great selling point -- increased property values. For the last two decades, the Leisure World retirement communities in Seal Beach and Laguna Hills have offered cinder-block walls topped by barbed wire and round-the-clock guards to its residents. The Laguna Hills site, with 21,000 residents, is virtually its