The biker is riding around a curve in the road.
A biker is following the road.
Not all roads are curved and the biker could even be going the wrong way on the road which would not be following the road.
exists e1 x1 x2 x3.(n_road(x3) & n_biker(x1) & in(e1,x3) & around(e1,x2) & n_curve(x2) & Actor(e1,x1) & v_ride(e1))
exists e1 x1 x2.(n_road(x2) & Theme(e1,x2) & Actor(e1,x1) & v_follow(e1) & n_biker(x1))