We prove that a 2-connected graph G of order p is traceable if /N(u)boolean OR N(v)/+ /N(w)boolean OR N(x)/greater than or equal to p-1 for all 4-tuples {u, v, w, x} with d(u, v)=d(w, x)=2(u, v, w,x are distinct vertices of G). In addition, we give a short proof of Lindquester's conjecture.