As Hiro and Vitaly approach the vast freeway overpass where tonight's concert is to take place, the solid ferrous quality of the Vanagon attracts MagnaPoons like a Twinkie draws cockroaches. If they knew that Vitaly Chernobyl himself was in the van, they'd go crazy, they'd stall the van's engine. But right now, they'll poon anything that might be headed toward the concert.

When they get closer to the overpass, it becomes a lost cause trying to drive at all, the thrashers are so thick and numerous. It's like putting on crampons and trying to walk through a room full of puppies. They have to nose their way along, tapping the horn, flashing the lights.

Finally, they get to the flatbed semi that constitutes the stage for tonight's concert. Next to it is another semi, full of amps and other sound gear. The drivers of the trucks, an oppressed minority of two, have retreated into the cab of the sound truck to smoke cigarettes and glare balefully at the swarm of thrashers, their sworn enemies in the food chain of the highways. They will not voluntarily come out until five in the morning, when the way has been made plain.

A couple of the other Meltdowns are standing around smoking cigarettes, holding them between two fingers in the Slavic style, like darts. They stomp the cigarettes out on the concrete with their cheap vinyl shoes, run up to the Vanagon, and begin to haul out the sound equipment. Vitaly puts on goggles, hooks himself into a computer on the sound truck, and begins tuning the system. There's a 3-D model of the overpass already in memory. He has to figure out how to sync the delays on all the different speaker clusters to maximize the number of nasty, clashing echoes.

The warm-up band, Blunt Force Trauma, gets rolling at about 9:00 P.M. On the first power chord, a whole stack of cheap preowned speakers shorts out; its wires throw sparks into the air, sending an arc of chaos through the massed skateboarders. The sound truck's electronics isolate the bad circuit and shut it off before anything or anyone gets hurt. Blunt Force Trauma play a kind of speed reggae heavily influenced by the antitechnological ideas of the Meltdowns.

These guys will probably play for an hour, then there will be a couple of hours of Vitaly Chernobyl and the Meltdowns to look forward to. And if Sushi K shows up, he's welcome to make a guest appearance at the mike.

Just in case that actually happens, Hiro pulls back from the delirious center of the crowd and begins to orbit back and forth along its fringes. Y.T.'s in there somewhere, but no point in trying to track her down. She would be embarrassed, anyway, to be seen with an oldster like Hiro.

Now that the concert is up and running, it will take care of itself. The............