Just in time for warmer weather, the new A4 food truck is hitting the pavement running, or rather rolling. Nestled among other trucks in popular places like Dewey Square and along the Rose Kennedy Greenway near Rowes Wharf, this mobile extension of Area Four restaurant in Kendall Square has hand-painted gray-scale graffiti and chartreuse yellow signage. It’s outfitted with chrome counters, pedestrian-level pastry cases, and a digital menu on a screen embedded in the truck’s body (hard to read in the sunlight). The crew, including Area Four co-owner and chef Michael Leviton, moves swiftly doling out flaky pastries, cookies larger than your hand (try ginger molasses, $2), and a variety of piadinei ($6.50 to $8.50), grilled flatbread sandwiches (think Italian quesadillas). Flavors range from the classic, with prosciutto, arugula, tomato jam, and a melted cheese blend, to tomato basil, combining tomato jam, provolone, arugula, and a spicy pesto. The A4 food truck will change its menu as ingredients come into season. And don’t worry about the dim digital menu. The truck has since added a chalkboard menu and tinkered with the backlighting on the screen. When a food truck goes high tech, it’s bound to take a couple tries. Follow A4 food truck on Twitter @A4truck or go to www.facebook.com/areafourcambridge.