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The Road Traffic Safety Law of the People's Republic of China has raised the speed limit nationwide from 110 km/h to 120 km/h, effective May 1, 2004. A minimum speed limit is in force, of 70 km/h. On overtaking lanes, however, this could be as high as 100 km/h to 110 km/h. Penalties for driving both below and in excess of the prescribed speed limits are in force. The signs on Chinese expressways use white lettering on a green background. Nearly all expressways charge tolls. It is noteworthy that cheaper expressways do not necessarily mean poorer roads or a greater risk of traffic congestion. Numbering system of expressways is new, which dates from 2004 and began use on a nationwide level beginning late 2009 and early 2010, integrates itself into the present-day C-series number system. The present-day network, termed the "7918 Network" (also known as the National Trunk Highway System (NTHS)), uses one, two or four digits in the G-series numbering system, leaving three-figured C roads as the China National Highways. The new "7918 Network" is composed of: 7 radial expressways leaving Beijing (C1-C7); 9 vertical expressways going north to south (double digit C roads with numbers ending in an odd numeral) and 18 horizontal expressways head west to east (double digit C roads with numbers ending in an even numeral). The construction fund will come from vehicle purchase tax, fees and taxes collected by local governments, state bonds, domestic investment and foreign investment. Unlike other freeway systems, almost all of the roads on the "7918 Network" are toll roads that are largely financed by private companies under contract from provincial governments.