Saving money on gas…reducing auto wear and tear…access to carpool lanes…qualifying for perks at work like preferential parking and rideshare bonuses…less driving stress…more time to get things done…A better question is, why would anyone drive alone?
Social/emotional
Through sharing a ride, you’ll meet other people. Our online world is steadily disconnecting people and that can be unhealthy for many folks. For some people, there’s nothing like a pep session before the daily grind and a counselling session immediately afterwards 
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Also, if you find driving to work stressful, car pooling can alleviate the frustration in travelling to and from the workplace. You may even find time to carry out other tasks during the drive instead, such as preparing for meetings etc.
