Is it safe to delete items out of quote, quote_item, quote_address

We have some fairly large tables for our quote_* tables. Is this just shopping cart data? Is it safe to delete?

magento.quote_address | 40.74M | 13.27G magento.quote_item | 19.76M | 5.00G magento.quote | 20.98M | 3.74G magento.quote_shipping_rate | 20.16M | 2.32G magento.quote_item_option | 19.95M | 1.16G magento.quote_payment | 19.24M | 1.12G

submitted by /u/rnd__username
[link] [comments]