F-roads differ significantly from other roads in Iceland, and you’ll need a suitable 4×4 or 4WD vehicle to navigate them safely and legally. F-roads (short for fjallvegur, or “mountain road” in Icelandic) are gravel tracks leading into Iceland’s highlands. “Even in summer, rivers can change depth quickly depending on weather or glacier melt. Renting a Vehicle for F-Roads: What to KnowHere are a few essential guidelines to help you plan:4×4/4WD Required by LawYou cannot drive on F-roads with a 2WD vehicle. Follow updates from the Icelandic Road and Coastal Administration (Vegagerðin).