Why is Willy home? Why is Linda alarmed that he is home?

Willy claims he's home because he's tired to death and couldn't make it through the rest of his trip. He got only as far as Yonkers, and doesn't remember the details of the trip. He tells Linda that he kept swerving onto the shoulder of the road, but Linda thinks that it must be faulty steering in the car. Linda is alarmed because she worries that he smashed the car