Determination of Curve Speed Zones for Mountainous Freeways

Table 1

Advanced warning sign placement distance (in feet).

Posted speed limit (85^th percentile speed mph)	Deceleration condition to listed; advisory speed (mph) (desired speed condition)
	10	20	30	40	50
20	—	—	—	—	—
25	100	—	—	—	—
30	150	100	—	—	—
35	200	175	—	—	—
40	275	250	175	—	—
45	350	300	250	—	—
50	425	400	325	225	—
55	500	475	400	300	—
60	575	550	500	400	300
65	650	625	575	500	375