LANSING, Mich. (AP) — Governor Jennifer Granholm says she'll sign legislation requiring all children who are both under age 8 and shorter than 4-foot-9 to be fastened into a booster seat.

Current Michigan law requires children under 4 to ride in a child restraint system.

The Legislature on Wednesday finished passing the bill and sent it to Granholm's desk.

Sponsors of the legislation say more than 90 percent of children between 4 and 8 years old who are seriously injured in auto accidents aren't restrained in a booster seat.

The law would take effect July 1. Violators will face fines and courts costs of up to $65 per offense.

Michigan will become the 39th state to adopt an expanded booster seat law.