
Yes, a car is legally allowed and mechanically capable of driving on the motorway. Vehicles like the Smart Fortwo meet all federal safety standards required for highway use. However, the experience is significantly different from driving a conventional car due to the Smart's small size, light weight, and relatively low horsepower.
The primary challenge is stability in crosswinds and when passing large trucks. The car's short wheelbase and light curb weight can make it feel buffeted by strong gusts. You'll need to keep a firm grip on the steering wheel. For safety, it's best to stay in the right-hand lane and maintain a consistent speed. While the latest models can reach and sustain motorway speeds (e.g., 70-80 mph), overtaking requires careful planning as the acceleration is modest. The small engine will be working hard, so expect higher cabin noise and lower fuel efficiency at these sustained high speeds compared to city driving.
From a technical standpoint, the car is designed for it. Features like Electronic Stability Program (ESP) are standard, which helps maintain control. The torsion beam rear axle in the chassis tuning also contributes to stability. The key is driver adaptation: understanding the car's limitations and driving defensively.
Here is a comparison of key specifications for a typical Smart Fortwo against a common highway sedan:
| Specification | Smart Fortwo (Example) | Typical Compact Sedan (Example) |
|---|---|---|
| Horsepower | 89 hp | 158 hp |
| 0-100 km/h (0-62 mph) | ~10.5 seconds | ~8.0 seconds |
| Curb Weight | ~1,800 lbs (820 kg) | ~3,000 lbs (1,360 kg) |
| Wheelbase | 74.4 inches (1.89 m) | 106.3 inches (2.70 m) |
| Fuel Economy (Highway) | ~38 mpg | ~42 mpg |
| Overall Length | 106.1 inches (2.69 m) | 182.3 inches (4.63 m) |
In summary, you can absolutely take a smart car on the motorway for a journey. It's a viable, though not necessarily relaxing, option for a confident driver who is aware of its unique driving dynamics.

I drive my car on the interstate all the time to get to work. It’s totally fine. You feel every bump and when a semi-truck roars past, it pushes the car a little. You get used to it. I just stay out of the fast lane, keep a steady speed, and let everyone else race by. It’s incredibly cheap on gas for my commute. Just be prepared for people to stare and give you thumbs-ups.

As an engineer, the answer is yes, but with important caveats. The vehicle's design prioritizes urban agility over high-speed stability. Its short wheelbase and low weight mean a higher sensitivity to aerodynamic forces from wind and passing vehicles. While it possesses adequate power to reach speeds, its safety margins in emergency maneuvers are smaller than a larger vehicle. Driver awareness and anticipation are critical. It's capable, but not optimal for long, high-speed journeys.

I was nervous the first time I took my on the freeway, but it handled it better than I expected. You have to be a proactive driver. Merge confidently, use your acceleration lanes fully, and keep a bit more space around you than usual. The biggest pro is parking at the other end—you can fit anywhere. It’s a trade-off: a bit more attention required on the road for ultimate convenience when you arrive.

Think of it as a motorcycle with a roof. You are small on the road, so your driving strategy should be similar: be highly visible, assume others don’t see you, and avoid blind spots. The car is and can do the speed limit. The real question is your comfort level. If you’re an attentive, defensive driver, a smart car is a functional and fuel-efficient choice for highway travel. It forces you to be more engaged with your driving, which isn’t a bad thing.


