function c = c_R(v)
%   C_R velocity
%   C_R(V) computes the rolling resistance coefficient for
%   a vehicle travelling at velocity V in m/sec.
%   We are assuming that the vehicle uses radial-ply tires.
%   Source: Volvo Powertrain Corp.
%   http://www.mvs.chalmers.se/~thomson/togv/lecture-OH-x4.pdf
%   Equation used: Wong, eq 1.1

error(nargchk(1, 1, nargin));

c = 0.0136 + 0.04 * 10^-6 * (v * 3.6)^2;