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Republic of San Marino: A country without "Solar Signal Lights"

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The Republic of San Marino is one of the oldest pocket states in Europe. It is a "country within a state" surrounded on all sides by Italy. The terrain is dominated by Mount Ditalino in the central part, the hills extend from north to southwest, and the northeast part is a plain. The country has beautiful scenery. During the peak travel season, the streets are full of people and traffic. More than half of San Marino's national income comes from tourism, which is the country's pillar industry.
San Marino has a population of just over 20,000, but owns 50,000 vehicles of various kinds.

Moreover, San Marino has a very small land area, making it the third smallest country in Europe. From this point of view, the country's traffic conditions should be very congested. But in fact, the roads here are very smooth, and there are very few traffic jams. You don’t have to worry about traffic jams occasionally, and it will be smooth again soon. At the same time, San Marino also has a very special place, that is, no Solar Signal Light can be seen at intersections of various sizes.

Without , traffic is organized, which is sure to confuse you. It is natural for people to think that it is because the quality of the country's citizens is very high, and everyone consciously abides by the traffic rules, so there will be no traffic jams. This is certainly a reason, but the real reason is not there. If you drive around San Marino for a few laps, you will find that the roads here are almost all one-way lanes and circular lanes. If you drive all the way to the end, you will return to the same road without knowing it.

At intersections without signals, drivers will consciously abide by the rule of "small roads give way to main roads, and branch lines give way to main lines"; and each intersection is marked with the word "stop", and all cars that merge into the main road will stop and wait and see. Wait, you can only enter when you can see clearly that there is no car on the trunk line.
It can be seen that scientific highway design and traffic management are the real reasons why San Marino has no Solar Signal Lights and no traffic jams.