Motoring writer Leon Poultney asked the experts what to do if you get the call.
If you stay calm, it will help the person on the other end of the line keep their cool as well. Then, tell them to make sure their car is on the hard shoulder or as far off the road as possible, with front wheels turned to the left to stop it rolling into traffic.
High visibility and warm clothing are part of our emergency pack contents list, which you can see in full further down this article.
'Before they get out of the vehicle, tell them to put on reflective clothing, especially if it's dark or wet,' says Richard Gladman, head of driving and riding standards at IAM RoadSmart (@IAMRoadSmart).
You should also make sure they've turned the car hazard lights on and, if possible, sidelights.
Tell them to safely place a warning triangle somewhere visible on the road, at least 45 metres in the direction of oncoming traffic.
'Everyone in a broken-down car should get out through doors on the left-hand side at the side of the road and stand well clear of traffic, behind a safety barrier if possible,' says Peter Rodger, the chief examiner of the Institute of Advanced Motorists.
It helps if the caller has a working smartphone with GPS functionality. If they haven't, quiz them on the last junction they passed to get a rough idea of their whereabouts.
If they're driving in an area they're unfamiliar with, especially one that has patchy signal, they should download the local area map onto their phone first. That way, they can use GPS even if they lose data.
If they can't get reception, tell them to look for markers at the side of a motorway, or try and locate the nearest safe place to find out, such as a shop, service station or business.
'Tell the person who has broken down never to walk across a motorway or dual carriageway to get to an emergency phone.'
If there is an emergency phone on the same side of the road as the caller, tell them to use this to contact the emergency services, as they can use it to pinpoint your location.
Naturally, having breakdown cover information in the car will help, while car insurance documentation may be required if the vehicle is damaged.
No one in the family has broken down before? Lucky you! But never say never. Thankfully for any driver on the road, there are actions that can be taken to lessen the likelihood of a breakdown.
As cars become more complex, owner knowledge of maintenance and general upkeep diminishes,' says Nick Francis.
'Many drivers don't carry items such as spare water, oil, bulbs and fuses, even though they are often essential. Make sure these are in their car and that they learn how to fit them.
'However, if it's not safe to carry out the job, leave it to the breakdown experts.'
'However unlikely running out of fuel might sound, it's the cause of one in 20 breakdowns on the motorway network,' says Dominic Tobin, editor of Buyacar.co.uk (@buy_a_car).
Jim O' Sullivan, the chief executive of Highways England, has said that motorists who try to eke the most out of a tank and drive with the low fuel warning light on are irresponsible.
'Pinching the pennies is one thing but conking out on the hard shoulder really isn't worth the savings,' Tobin says.
'Car batteries and alternators can take a beating in the winter. Adverse weather calls for lights, heating and ventilation to be running full blast and the drop in temperature can actually affect the battery chemistry,' says Will Dron (@wdron), acting editor at Sunday Times' Driving.co.uk.
'It's a good idea to check the health of a car's battery and ensure it can cope with sat navs, smartphones and other devices that may need charging. The extra strain on a battery could lead to a breakdown.'
Digital battery testers, which connect directly to the terminals, can be bought for between £20-£100. Alternatively, garages will perform a battery test for a fee.
Whatever you do to avoid them, breakdowns will still happen. Thankfully, there are ways to prepare for long waits at the side of the road.
'Try to pack an emergency bag with the basics – a drink, some snacks and items to keep passengers warm and safe,' says Richard Gladman.
This emergency pack should contain:
There are also specific breakdown kits, which include items such as towing ropes, torches, tyre inflation devices and hazard warning triangles.
'Many new cars come with a warning triangle in the boot, but manufacturers are increasingly replacing spare wheels with tyre repair kits, which spray foam into punctured tyres to seal them up, so you can drive to a garage and get them replaced,' says Dominic Tobin.
'But these only work for small punctures. If a tyre gets sliced open or has a blow-out, then the car's occupants could be left waiting to be recovered, so it's handy to know exactly what is in the car.'
Before driving, make sure the vehicle is fit for the journey ahead, pack some important items and keep essential information handy. If the worst happens, remain calm, follow the simple steps above and call for help as soon as everyone is in a safe location.
Do you have any top breakdown tips? Or perhaps you've had an experience we could all learn from. Share your story with us on Twitter or Facebook, we'd love to hear from you.
Follow Leon Poultney on Twitter @Blokesincars for more motoring tweets.