The Des Moines International Airport has launched the full Indect parking system, which uses red and green lights to show whether a spot is open (green means it is) and even a 60- by 90-inch screen at the garage entry off Cowles Drive. Signs within the garage will point drivers to areas with open spaces. The $818,000 system has 1,398 individual sensors and 27 directional signs. A red light above a stall mean the space is taken. Blue means it is reserved for those with disabilities. The system uses real-time data to make sure motorists can find empty spaces quickly. shows parking availability on the web, so you can check ahead of time. Other airports using the system are in Dallas, Houston, Atlanta, Oklahoma City, Tampa, San Diego and Orange County, Calif.