Dirt bikers traverse a series of jumps.
bikers are riding down the highway
A series of jumps is not on the highway.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_traverse(e1) & of(x3,x4) & n_jump(x4) & n_series(x3) & n_biker(x1) & (x1 = x2) & ne_nam_dirt(x2))
exists e1 x1 x2.(n_highway(x2) & down(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_biker(x1))