This weekend, eligible Capital One cardholders can receive 4 free rides on uberPOOL in select cities. UberPOOL, a service introduced by Uber last year, matches riders heading in the same direction to share rides, so that the cost is split.

To take advantage of this promotion, enter promo code CAPITALONEPOOL, choose uberPOOL and select your eligible Capital One card as your payment method. Eligible cards include US-issued credit cards open and in good standing, as well as debit cards from Capital One and Capital One 360.

Participating cities include:

• Atlanta, GA
• Austin, TX
• Boston, MA
• Chicago, IL
• Los Angeles, CA
• Miami, FL
• New York, NY
• Oakland, CA
• Philadelphia, PA
• San Francisco, CA
• Washington, DC

The promo doesn’t appear to have a price limit stated, only that each free ride must begin and end in the same city. (Source)