Cross a state line and laws change. That's especially true between New Hampshire and Massachusetts.

Laws relating to seat belts, guns, cellphones, motorcycle helmets, fireworks and knives are among those lawmakers want to warn people about. That's not to mention alcohol and tobacco prices and New Hampshire's tax-free shopping.

Six GOP lawmakers want the Department of Transportation to erect signs along every unmarked road leading from New Hampshire into Massachusetts, stating: "Warning: Massachusetts Border 500 Feet."