# Commission Delegated Regulation (EU) 2015/68 of 15 October 2014 supplementing Regulation (EU) No 167/2013 of the European Parliament and of the Council with regard to vehicle braking requirements for the approval of agricultural and forestry vehicles (Text with EEA relevance), Division 2.5.4.2

Extent: E+W+S+N.I.

For the road test the conditions shall be as follows:
Number of brake applications
20
Duration of a braking cycle
60 s
Initial speed at the beginning of braking
60 km/h
Braking applications
In these tests, the force applied to the control device shall be so adjusted as to attain the mean fully developed deceleration of 3 m/s2 in respect to the towed vehicle mass PR at the first brake application; this force shall remain constant throughout the succeeding brake applications.
The braking rate of a towed vehicle is calculated according to the formula given in point 2.2.3.5:
z R = z R + M − R × F M + F R F R + R The speed at the end of braking:
v 2 = v 1 × F M + F 1 + F 2 ∕ 4 F M + F 1 + F 2 Where:
zR braking rate of the towed vehicle,
zR + M braking rate of the vehicle combination (tractor and towed vehicle),
R rolling resistance value = 0,01
FM total normal static reaction between the road surface and the wheels of tractor (N),
FR total normal static reaction between the road surface and the wheels of towed vehicle (N),
F1 normal static reaction of the part of the mass of the towed vehicle borne by the unbraked axle(s) (N),
F2 normal static reaction of the part of the mass of the towed vehicle borne by the braked axle(s) (N),
PR PR = FR/g
v1 initial speed (km/h),
v2 final speed (km/h).

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Source: https://www.legislation.gov.uk/eur/2015/68/annex/II/division/2/division/2.5/division/2.5.4/division/2.5.4.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2015-68/annex-II/division-2/division-2.5/division-2.5.4/division-2.5.4.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.