CONCORD, N.H. (AP) — Snowmobilers in New Hampshire, Vermont and Maine are taking part in a three-day weekend when riders registered in any one of those states can explore the trails of the other two states for free.

Starting Friday, any snowmobile legally registered in any of the participating states is allowed on trails in all three states. All other host state regulations apply, including speed limits, youth laws and Vermont’s mandatory liability insurance law.

New Hampshire and Vermont have held an annual reciprocity weekend since 2010. Maine passed a law in 2011 to join the weekend festivities.

The states have agreed to allow trail access without having to pay another state for the opportunity to ride there. Officials said it’s good for the economy of all three states.

The event runs through Sunday.