Tendency to ramp up

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The superelevation rollover .DELTA.s (in Switzerland secondary pitch .DELTA.i ) is a term in the road construction and refers to the slope of the gradient -related longitudinal slope of a road edge. It occurs in twisted areas (change in the transverse slope of the roadway).

It is calculated from the distance between the edge of the road and the axis of rotation a , the change in slope Δq and the length of the twisting area l :

The minimum length of the twisting path results from:

Limit values ​​for Germany

The relevant technical regulations for country roads, guidelines for the construction of country roads (RAL), specify minimum and maximum values ​​for the tendency to ramp up depending on the design speed . From this, the minimum and maximum lengths of the twisting area can be calculated.

Design class max Δs [%] min Δs [%] at q ≤ 2.5%
EKL 1 / EKL 2 0.8 0.1 * a
EKL 3 1.0 0.1 * a
EKL 4 1.5 0.1 * a

The following limit values ​​of the guidelines for the construction of motorways (RAA) apply on motorways :

Design class min Δs [%] max Δs [%] at a <4.00 m max Δs [%] at a ≥ 4.00 m
EKA 1 / EKA 2 0.10 * a 0.225 * a 0.9
EKA 3 0.25 * a 1.0

The limit values ​​of the RASt apply to urban roads :

Road type max Δs [%] min Δs [%]
attached city street no specification 0.1 * a
main road without cultivation with v perm = 50 km / h 0.50 * a
2.0 (a ≥ 4.0 m)		 0.1 * a
main road without cultivation with v perm = 70 km / h 0.40 * a
1.6 (a ≥ 4.0 m)		 0.1 * a

Limit values ​​for Switzerland

In Switzerland, the VSS 40 120 standard defines the following limit values:

Street type max Δi [%] min Δi [%] at p ≤ 3.0%
High-performance roads 1.0 0.1 * a
Remaining roads outside populated areas 1.5 0.1 * a
Remaining roads within populated areas 2.0 0.1 * a

See also

literature

Individual evidence

  1. ↑ a b Norm VSS 40 120: Lines; Cross slope in straight lines and curves, change in cross slope, edition 2019-03