The North American auto industry is likely to sell a record 18.2 million number of cars and light trucks this year before higher interest rates and urbanization starts putting the brakes on growth, an expert said. "We're still seeing robust demand, but we're entering into a slower growth phase," Mike Wall, director of automotive analysis for IHS Automotive, said Wall in a taping of West Michigan Week , which will air this weekend on WGVU-TV.