CHICAGO — Starting in August, Lyft will offer 100 Chicago residents $550 each in credit to Lyft and several other mobility services if they ditch their personal vehicles for a month, reports The Verge.

People who accept the challenge to put away their car keys for 30 days will get $300 in Lyft shared ride credit (for use in carpool trips only), $45 for a monthly Divvy bike-share pass, $100 in Zipcar credit, and $105 for “L” train and bus service.

Those interested in participating will need to prove to Lyft that they own a vehicle to qualify, with the company relying on the honor system to make sure people live up to their end of the bargain. Lyft is also encouraging participants to post about their 30-day multimodal experience on social media. For the full story, click here.