HUNTSVILLE, ALA. — Mazda and Toyota leaders have selected Huntsville as the site of their new joint venture auto manufacturing plant. The automakers will invest $1.6 billion in the facility, located approximately 14 miles from Toyota’s existing Huntsville plant. The new plant will have the capacity to build 300,000 vehicles annually, with production split evenly between the two lines for each company to produce the Toyota Corolla and Mazda’s crossover model that will be newly introduced to the North American market. The facility is expected to create up to 4,000 jobs, and production is expected to begin by 2021. The joint venture plant marks the 11th U.S. manufacturing facility for Toyota.