PHOENIX — The small, compact luxury crossover segment is growing rapidly, with numerous manufacturers flooding the market with a vast choice of vehicles and trim levels. Audi Q3, BMW X1, Infiniti QX30 are just a few, with Jaguar’s new E Pace going on sale in 2018. We last drove the Mercedes-Benz GLA 250, the German automaker’s first compact crossover utility vehicle, shortly after it was introduced back in 2015. It’s actually more of a hatchback than an SUV and is smaller than the company’s GLC compact crossover.