Driving along a more than 40-kilometer section of the National Route 15 in Argentina without turning the steering wheel a single time causes the driver to experience a specific state known as “road hypnosis.” It is this stretch of highway, connecting the cities of Villa Union and Chilecito in the province of La Rioja, that is officially recognized the most direct road in the world, which is confirmed by satellite images and engineering measurements. Unlike European highways, where straight sections are artificially broken to increase attention, here nature and designers have created an ideal geometric line stretching into the horizon.
The visual perception of such a road surface is radically different from the usual driving along winding roads or city avenues. Panorama it is static here: dry plains, sparse bushes and an endless sky create a vacuum effect in which the sense of speed disappears. For truckers and tourists, this is both a blessing, allowing them to maintain stable fuel consumption, and a serious psychological test of endurance.
Geographical location and history of creation
The world-famous route runs through the arid regions of northwestern Argentina, in close proximity to the Sierra Veliasco mountain range. The construction of this section was dictated by the need to connect remote settlements by the shortest route, bypassing the complex terrain of the Andean foothills. The engineers decided not to go around small irregularities in the landscape, but to cut them off, creating an embankment that visually appears to be a drawn ruler on the surface of the earth.
The length of an ideal straight section is approximately 43 kilometers, which is an absolute record for public roads. By comparison, many famous straight highways in the US or Australia have sections with minimal curvature or elevation changes, whereas the Argentine section maintains azimuth to the nearest degree. This was made possible due to the low population density and the absence of the need to fit the road into the existing infrastructure.
It is important to note that the road is not abandoned or private - it is a full-fledged part of the national transport network. Trucks carrying goods between provinces and tourist buses regularly travel along it. However, due to the distance from large cities, the traffic here is not too intense, which allows you to enjoy the view of endless horizon without constant overtaking.
Technical characteristics of the roadway
The track surface is classic asphalt concrete, the quality of which varies depending on the year of the last repair. Given the aggressive effects of ultraviolet radiation and temperature changes in the desert zone, the road requires constant monitoring of its condition. On straight sections, a “wave” effect or longitudinal cracks often occur if the base reinforcement technology was not followed during construction.
The width of the carriageway meets the standards for roads of this category, allowing for safe oncoming traffic. However, the absence of a dividing strip on some sections requires increased discipline from drivers. Marking can be partially erased by sandstorms, which forces drivers to navigate along the edge of the roadway or the tracks of previous cars.
Text of useful advice: When driving along perfectly straight sections in the desert, try not to fix your gaze strictly on one point on the horizon - this accelerates the onset of fatigue. Periodically look at the instruments or side mirrors.
A feature of the technical characteristics is the minimum transverse slope. On ordinary roads, they roll to drain water, but here, in the arid zone, this parameter is minimized, which creates the feeling of driving in a straight line. This affects the behavior of the car in the rain, which rarely happens here, but does occur in the form of downpours that turn the roadsides into a muddy mess.
The phenomenon of road monotony and hypnosis
Long movement on the most direct road in the world provokes a condition that psychologists call highway hypnosis. The driver's brain, not receiving new visual stimuli in the form of turns, signs or changes in scenery, goes into energy saving mode. The reaction to sudden obstacles, such as an animal running out or a stone appearing on the road, in this state slows down several times.
The monotonous hum of the engine and the rhythmic flickering of markings (if there are any) act like a hypnotist’s pendulum. The driver can drive several kilometers without remembering this part of the route. This is a dangerous condition, since technically the person is driving, the eyes are open, but cognitive processing of information is practically stopped. That is why on such routes it is recommended to stop more often than required by the rules.
To combat this effect, experienced truckers use various techniques. Some people turn on audiobooks or podcasts that require comprehension, others carry on a conversation with passengers. The main thing is not to let the brain “switch off” into automatic control of the muscles of the legs and arms.
☑️ Checklist for preparing for a trip along a desert highway
Comparison with other known straight routes
Although the Argentine section holds the lead in continuous length, there are other notable straight roads in the world. For example, Highway 10 in Washington State (USA) or the Eyre Highway in Australia are also famous for their long straight sections. However, they often have micro-bends or changes in topography that prevent them from being completely straight in the geometric sense.
Below is a comparative table of characteristics of straight sections of roads in different countries:
| Country | Track name/Region | Length of straight section (km) | Coating features |
|---|---|---|---|
| Argentina | National No. 15 (La Rioja) | ~43.0 | Asphalt, desert |
| USA | North Dakota Highway 46 | ~12.8 | Asphalt, plains |
| Australia | Eyre Highway | ~146 (with breaks) | Asphalt, bush |
| Saudi Arabia | Highway 10 | ~10+ (sections) | Asphalt, desert |
It is worth noting that new highways are also being built in Saudi Arabia with claims to record lengths of straight sections, but their status as “public roads” is sometimes limited. The Argentine highway remains accessible to any vehicle with normal off-road capability.
Practical advice for drivers
When planning a trip to this region, it is necessary to take into account the climatic conditions. Temperatures in La Rioja province can reach extremes during the day, putting a strain on the engine cooling system. Overheating on a straight road it happens less often due to the constant flow of air, but when stopping, the risk of antifreeze boiling increases.
The second important aspect is fuel supply. Gas stations can be located at a considerable distance from each other. It is categorically not recommended to move with an empty tank “to the point of light” here, since help may not come soon. Always keep a reserve of 100-150 kilometers.
⚠️ Attention: At night there is practically no artificial lighting on such routes. Oncoming headlights on a completely straight road are more blinding than usual due to the lack of glare from corners and trees. Use the right edge of the road as a guide and reduce your speed.
The third tip concerns navigation. Mobile communications in these areas are extremely unstable. Download offline maps of the region in advance and save the coordinates of the nearest settlements. A paper map or printed route will also come in handy in the glove compartment.
Interesting fact about construction
The engineers who designed the site used high-precision theodolites to set the direction. They say that if you stand at one end of the site and look along the road, then at the other end you can see a car moving away without blinking, since the line of sight is not blocked by anything.>
The influence of straight sections on fuel consumption
From an economic point of view, driving along a perfectly straight road is the most profitable mode for a car. Eliminating the need for braking before turns and subsequent acceleration allows the engine to operate in the optimal speed range. Fuel consumption on such sections can be 15-20% lower than on winding roads with similar surfaces.
Cruise control becomes an indispensable assistant in such conditions. It not only frees the driver's right foot, but also maintains a constant speed, eliminating the human factor and micro-oscillations of the accelerator pedal. However, you cannot rely on it completely, especially if there are bumps or animals on the road.
For freight transport, such routes are a gift from logistics. The ability to maintain a high average speed without frequent gear changes significantly reduces cargo delivery time. This makes Route 15 a strategically important artery for the region's economy.
Safety and risks on the road
Despite the apparent safety of the absence of turns, the statistics of accidents on such highways can be high. The main reason is loss of concentration and falling asleep while driving. The second risk factor is animals. In desert and semi-desert areas, wild animals often run out onto the road, blinded by headlights or disoriented.
It is also worth considering the wind factor. In open spaces, gusty side winds can significantly blow away a vehicle, especially a tall and light one (vans, empty trucks). The driver must constantly adjust the course, which is done unconsciously on a straight road, but requires muscle tension.
⚠️ Attention: If you feel that your eyelids are getting heavy and the road is starting to “float”, stop immediately. 15 minutes of sleep in the car will save lives more effectively than liters of coffee. Don't try to induce sleep with music or open windows.
Concluding the review, we can say that the straightest road in the world is a unique engineering and natural object. It gives an incomparable feeling of freedom and flight, but requires iron discipline from the driver and an understanding of the physiological processes of his body.
Frequently asked questions (FAQ)
Is it possible to drive along the most direct road in a regular car?
Yes, Route 15 in Argentina is paved and suitable for all passenger cars. A special SUV is not required if you do not plan to pull off to the side of the road.
Is there a speed limit on this section?
Speed limits depend on Argentina's general traffic regulations for roads outside built-up areas (usually up to 110-130 km/h), but specific signs may set local limits. The straightness of the road does not mean permission to race uncontrollably.
Is it true that you can get lost on this road?
Getting lost in the sense of “not finding a turn” is difficult, since there is only one road. However, due to the monotony of the landscape and the lack of landmarks, it is easy to lose track of time and distance, missing the right exit or not noticing damage along the way.
What is the best time of year to visit this track?
It is best to plan a trip in the spring (September-November) or autumn (March-May) months, when the air temperature is more comfortable. In summer it is extremely hot here, and in winter night frosts are possible.