High-speed number: The high speed road with G begin is to show national high speed, the high speed road with S begin is provincial high speed. Follow so that the number also has at the back of this letter exquisite, the radiation that is a center with Beijing expresses with 1 digit, it is Beijing X high speed, for example high speed of high speed of G2 Beijing Shanghai, G3 Beijing stage. Of north and south and thing direction is to use two digit to express, for example high speed of G15 Shenyang sea, north and south to, g20 aid green high speed, thing to. The worst and divisional is high speed and country inside this, it is with " G " begin, it is OK to should see the number from the back only, as long as from the back following is 3 digit word, that is the country, following from the back is not 3 digit word, it is high speed. Want line of recognize high speed, nation, province way. High speed is with uppercase " G " or " S " of begin, it is one digit, two digit are mixed from the back 4 digit, for example G2, G15, G2001. The country also is with uppercase G begin, but the number from the back is 3 digit, for example G104, G204. Province path is with " S " begin " , 3 digit also are from the back. Cause very much more, because energy missed exit centrally not quite,the reason is on one hand, it is card of directive of not familiar high-speed on the other hand, did not prepare in time. Become a knowledge to high speed number, label so, beneficial and harmless. Countrywide freeway is too much, remember every viatic number very hard, the key should understand number regulation, master common sense of a few traffic sign again, give a safety to have safeguard greatly. In daily life, people drives go out to be able to be mixed more or less all right freeway contact with, freeway development is rapid now, extend in all directions. A lot of people are met because do not know freeway number,often reach traffic sign and go wrong, even overspeed, back a car, all sorts of illegal phenomena such as retrograde motion happen from time to tome, often cause very serious accident.