Democracy might not be free, but your ride to the polls this Tuesday could be.

That’s thanks to a promotion from Zipcar, which is giving members the chance to reserve a free car on Election Day evening this Tuesday between 6 and 10 p.m. Zipcar members can reserve a car for longer, but only those four hours are free.

The promotion is live now. Interested members should reserve their car quickly — Zipcar expects supplies will run out quickly.

The after-work promotion aims to ensure “members who need to zip to the polls during the last few hours have free, easy access to transportation,” the Boston-based company said in a statement.

By Massachusetts law, polls must remain open between 7 a.m. until 8 p.m., though some municipalities will start collecting ballots as early as 5:45 a.m. Voters registered in Massachusetts can check the location of their precinct’s polling place here.

Free Zipcars will be available Tuesday evening in all U.S. markets where the company has a presence, amounting to hundreds of cities and more than 500 college campuses, the company said. That includes three states that use mail-in ballots exclusively — Colorado, Washington, and Oregon — where “select Sweet Deal” cars will be available.

In other Election Day news, users who open the app of Zipcar’s ride-sharing competitor Uber this Tuesday will be prompted to type in the address where they’re registered to vote. Uber will then locate the rider’s polling place give the option hail a ride to the ballot box — presuming the rider isn’t registered to vote on the other side of the country. Since Uber doesn’t seem to be offering free rides this Election Year, that could get a bit pricey, to say the least.