ปี (คริสตศักราช)

หมายเลขทางหลวง

ตอนควบคุมของทางหลวง

ชื่อสายทางของตอนควบคุมของทางหลวง

จุดสำรวจ

จำนวนยานพาหนะที่ครอบครองพื้นที่ผิวจราจรใน 1 ช่องจราจร โดยกำหนดระยะทางจาก จุด ก ไป จุด ข

Level of capacity ratio: A = there are no cycles that are fully loaded, and few are even close to loaded. No approach phase is fully utilized by traffic and no vehicle waits longer than one red indication. Typically, the approach appears quite open, turning movements are easily made, and nearly all drivers find freedom of operation. B = B represents stable operation. An occasional approach phase is fully utilized, and a substantial number are approaching full use. Many drivers begin to feel somewhat restricted within platoons of vehicles. C = C stable operation continues. Full signal cycle loading is still intermittent, but more frequent, Occasionally drivers may have to wait through more than one red signal indication, and back-ups may develop behind turning vehicles. D = D encompasses a zone of increasing restriction, approaching instability. Delays to approaching vehicles may be substantial during short peaks within the peak period, but enough cycles with lower demand occur to permit periodic clearance of developing queues, thus preventing excessive back-ups. E = E represents the most vehicles that any particular intersection approach can accommodate. At capacity (V/C = 1.00) there may be long queues of vehicles waiting upstream of the intersection and delays may be great (up to several signal cycles). F = F represents jammed conditions. Back-ups from locations downstream or on the cross street may restrict or prevent movement of vehicles out of the approach under consideration, hence, volumes carried are not predictable. V/C values are highly variable because full utilization of the approach may be prevented by outside conditions.

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