19 de Junio (Highway 54). In 1945, the Metropolitan Thoroughfare Plan was submitted by Quezon City planners Louis Croft and Antonio Kayanan which proposed the laying of 10 radial roads, which purposes in conveying traffic in and out of the city of Manila to the surrounding cities and provinces, and the completion of six Circumferential Roads, that will act as beltways of the city, forming altogether a web-like arterial road system. The Department of Public Works and Highways (DPWH) is the government agency that deals with these projects. The road numbering for radial roads are R-1 up to R-10. The radial roads never intersect one another and they do not intersect circumferential roads twice; hence they continue straight routes leading out from the city of Manila to the provinces. The numbering is arranged in a counter-clockwise pattern, wherein the southernmost is R-1 and the northernmost is R-10. Circumferential roads are numbered C-1 to C-6, the innermost beltway is C-1, while the outermost is C-6. Radial roads There are ten radial roads that serves the purpose of conveying traffic in and out of the city of Manila to the surrounding cities of the metropolis and to the provinces, numbered in a counter clockwise pattern. All radial roads starts at Kilometer Zero, demarked by a marble marcos across the Rizal Monument in Rizal Park along Roxas Boulevard. Circumferential roads There are six circumferential roads around the City of Manila that acts as beltways for the city. The first two runs inside the Manila city proper, while the next three runs outside the City of Manila. Another circumferential road, the C-6, will run outside Metro Manila and is under construction. Highway network The radial and circumferential road numbers are being supplanted by a new highway number system, which the Department of Public Works and Highways have laid out in 2014. The new system classifies the national roads or highways as national primary roads, national secondary roads, and national tertiary roads. Primary national roads are numbered with one to two-digit numbers. Secondary national roads are assigned three-digit numbers, with the first digit being the number of the principal national road of the region. Secondary national roads around Manila mostly connect to N1 and are numbered with 100-series numbers. Expressway network Expressways are assigned with numbers with an E prefix to avoid confusion with numbered national roads. Expressways are limited-access roads, with crossing traffic limited