Britax Parkway Booster The Britax Parkway belt-positioning booster provides True Side Impact Protection? for advanced protection in side impact collisions. The Parkway features a one-hand, quick-adjust headrest and height positioning for proper fit. Other features include a two-position recline, color-coded belt guides, and convenient drink and snack holders. The Britax Parkway is designed for children weighing at least 30 pounds up to 100 pounds and measuring 38 inches to 60 inches in length. The Britax Parkway is the crown jewel of the booster car seat market. Parents also love this seat because it is a little bit smaller than its cousin the Britax Regent,the largest model of all Britax booster car seats. What's more, the Parkway Booster is one of the few US-made car seats that are approved for use in Canada by the CMVSS.