สูตรเลขวิ่งล่าง 16/08/62
National Parks welcome millions of visitors every year; for example, Yosemite passed the 4 million visitor mark in the 90s, and continues to climb. Most people use their private automobiles while traveling in the parks, which results in growing congestion, lowered visitor enjoyment, and more pollution from car exhaust. Intelligent Transportation Systems (ITS) may be at least part of the answer.
from: http://ezinearticles.com/?Intelligent-Transportation-Systems-Ease-Traffic-Congestion-For-National-Park-Visitors&id=6986392
