How to plan a road trip, step by step

Pick the start, the end and the two or three places you would be disappointed to miss, and draw the line between them before you look at anything else. The route decides what is possible each day; the stops fill it in. Check whether it is a loop or a one-way trip, because a one-way route usually carries a drop-off fee on a rental car and a way to get home.

Then cut the route into days from the fixed points back, not from the start forward. Put the must-see stops on days with room around them, and let the connecting days be the long ones.

Agree how long you are willing to be in the car on a normal day, in hours, before you choose stops. People disagree about distance but converge on hours, and hours are what a day is made of. A common approach is to hold a normal day to a few hours behind the wheel and spend the longer drives on days with nothing else planned.

Distances lie on roads that are slow, steep, unpaved or shared with traffic and wildlife. Use a mapping app for the estimate, then add time for every stop you plan to make. A route that fits only if you never get out of the car is not a road trip.

For each stop, ask what it adds that the road does not already give you. A viewpoint, a short walk, a meal worth a detour, or a town worth an hour is a good stop. A sight that costs ninety minutes of driving for ten minutes of looking usually is not.

Aim for one real stop a day and a couple of small ones, and leave an hour you can spend on whatever turns up. The best moments on a road trip are usually the ones that were not on the plan.

Lodging in a few places fills up well ahead: small towns with a handful of rooms, national park lodges and campsites, and anywhere that is the only practical stop on a long stretch. Book those first, on terms you can change, and let the rest stay flexible so a good day can run long.

Check how late the place expects you and where you will park. A room you reach at ten at night after a long drive is a different room from the one you booked in the afternoon.

Read the rental agreement for what it excludes. Many agreements rule out unpaved roads, certain mountain routes or ferries, and some charge for each extra driver or for one-way returns. Check what the insurance covers and what your card or home policy already does, and whether you need an international driving permit as well as your own licence.

Know how far a tank or a charge takes you, and how far apart the stops are on your route. On remote roads, fill up when the gauge reaches half, not when the light comes on. If the route runs through snow country in winter, ask what tires or chains are required.

Mountain passes, high roads and some park roads close seasonally or at short notice, and daylight changes the length of a safe driving day more than people expect. Look at the official road-condition and weather source for the region the week before you go and again the morning of each long drive, and keep an alternative route in mind for the day that matters most. The National Weather Service's safety pages cover hazards such as floods, fog, heat and winter weather, and the National Park Service's Plan Your Visit page points to each park's alerts and conditions.

Pack for the range of weather your route covers, not the average. A road trip can cross several climates in a day, and an extra layer and a rain jacket live in the car.

Download the offline maps for the whole route before you leave, and save your confirmations, addresses and the booking details where you can open them without a connection. Keep a paper copy of the one or two things that would hurt to lose: the first night's address and a contact for the rental company.

Agree a plan for if the car breaks down or the group gets separated: who calls whom, and where you will meet.

Decide up front who drives, how often you swap, and whether the people in the back can take a turn at navigating. Stop every couple of hours whether or not anyone asks, and keep snacks and water within reach. A tired driver is the main risk on a long trip, and the fix is a plan to swap rather than a promise to push through.

Treat the car as shared space. Agree what is allowed, what music is on and how often the group is allowed to stop for a photo.

Fuel, tolls, parking and the rental are the costs that pile up unnoticed. Have one person write each one down as it happens and say who paid, and settle once at the end rather than at every fuel stop. Agree beforehand whether the car costs are split evenly or by who rode when.

The method for keeping it fair is in the guide to splitting trip costs with friends, and the cost splitter on this site does the arithmetic.

The three routes below are the ones people most often ask about. Check the details for the dates you travel, because roads, passes and park rules change.

• The Road to Hana, Maui: a drive of about 52 miles (roughly 84 kilometers) from Kahului to Hana, which the Hawaiʻi tourism authority puts at two to four hours, known for its hundreds of curves and its one-lane bridges. The time is set by the stops, so plan a full day or an overnight in Hana, fill the tank first, and expect patchy signal.
• The Icefields Parkway, Alberta: 232 kilometers of mountain highway between Lake Louise and Jasper, with few places to buy fuel along it. It needs a Parks Canada pass, and conditions change quickly with the season, so check the road report before you set out.
• Iceland's Ring Road: a loop of about 1,300 kilometers around the island that most itineraries spread over a week or more. Check the road and weather services each morning, because wind and winter conditions decide the day.

In Ollin you describe the trip in a sentence and get a day-by-day plan with every stop on one map, in order, so you can see how the days connect. Each stop shows the forecast on the day it matters, there is a packing list tuned to the trip and the weather, and booking links for stays, rental cars and campsites. Everyone you invite works on the same plan, with a trip chat beside it. It is free for up to 15 travelers on a trip; saving a whole trip for offline is on Pro.