The length of all roads on the island is about 13,000 km (8078 mi) and only 4,782 km (2971 mi) of them are covered with asphalt. For example, the ring road, the so-called Route 1, Iceland's main S-class road is well-asphalted, it is a pleasure to drive along. All the rest are gravel roads: T - minor country roads more than 10 kilometers (6 mi) long, N - local roads between rural objects, F - unpaved roads with sharp stones and river fords, where you can only drive a 4x4.
You can choose and drive only along Route 1 and see the so-called “Golden Ring of Iceland." But if you are willing to travel and delve further into the island and see as many natural wonders as possible, then come in summer; in winter, due to storms, the roads that are blocked with snow are closed. You'll need to prepare in advance to travel along F roads.