Выражение встречается в следующем контексте: With no proper lane delineation and a lack of slip lanes and storage lanes for turning traffic, there is a lot of movement conflicts for the various approaches at road intersections.

Заранее огромное спасибо!!

storage lane - левый ряд/полоса, размеченная для поворота (полоса, на которой стоят машины, ожидающие возможности повернуть налево; длина ее разметки зависит от скорости движения)

Auxiliary Lane – the portion of the road adjoining the through lane for parking, speed changes, storage for turning, weaving, truck climbing or for other purposes supplementary to through traffic movement

Deceleration/Storage Lane – that portion of the auxiliary lane that is full width

"Leftturn lanes may provide added safety and efficiency at both unsignalized and signalized intersections. At signalized intersections, leftturn lane warrants are based on the magnitude of turning movements, accident experience, and general capacity relationships. The design values for leftturn approach tapers, turn bay tapers, and storage lane lengths are based on deceleration in the lane, storage in the lane, or a combination of both."

http://www.fhwa.dot.gov/environment/flex/ch08.htm

Leftturn lanes:

imho

With no proper lane delineation and a lack of slip lanes and storage lanes for turning traffic, there is a lot of movement conflicts for the various approaches at road intersections.

Если дорога/трасса не размечена должным образом, и нет дополнительных развязок и полос для поворота транспорта /(правого и левого поворота), то (...)

Slip lane - A raised island near the corner of an intersection that permits vehicular right turning traffic to move independent of signalization.

(видимо, это развязка или эстакада для беспрепятсвенного поворота направо)

"Figure 71. Typical lighting layouts. Drawing. Two typical lighting layouts are depicted. The first drawing shows a major five-lane road intersected by a crossroad. Partial lighting is required at the four corners of the intersection. Additional units for continuous lighting are required on the approaches to the intersection and are spaced in a staggered fashion on both sides of the road. The second drawing is a major four-lane road with a secondary road and a right-hand bypass lane. Partial lighting is required at the intersection corners and at the entrance and exit of the slip lane. Additional units for continuous lighting are required on the approaches to the intersection and are spaced in a staggered fashion on both sides of the road."