The company is easing its self-driving cars into rainy environments. Google is expanding its self-driving car project to Kirkland, Wash., a city that allows the company to test its driverless vehicles in a wetter environment. Google says it picked the city because it has a temperate climate with seasonal rain that is perfect for wet weather practice. The city’s hills will also allow the company to test its sensors at different angles and elevations, Google said in an emailed release.