An incorrect schedule. (It requires a flying bearer). The parts immediatly affected by the incorrect schedule are highlighted. No car can cross this bridge. 
:-$ bridgeplan(DB-Plan) <<< DB = big, db_bridgeplanf(DB,Plan).
@@	%  DB = big, Plan = [task(start,0,0),task(ex1,3,4),task(ex2,13,2),task(ex3,7,2),task(ex4,15,2),task(ex5,1,2),task(ex6,38,5),task(fp1,9,20),task(fp2,29,13),task(eth,0,10),task(fw1,10,8),task(fw2,18,4),task(fw3,29,4),task(fw4,42,4),task(fw5,6,4),task(fw6,46,10),task(cf1,18,1),task(cf2,22,1),task(cf3,33,1),task(cf4,46,1),task(cf5,10,1),task(cf6,56,1),task(ct1,19,1),task(ct2,23,1),task(ct3,34,1),task(ct4,47,1),task(ct5,11,1),task(ct6,57,1),task(mw1,20,16),task(mw2,36,8),task(mw3,44,8),task(mw4,52,8),task(mw5,12,8),task(mw6,60,20),task(dfb,30,2),task(pg1,44,12),task(pg2,56,12),task(pg3,0,12),task(pg4,92,12),task(pg5,80,12),task(rth,78,10),task(fg1,56,15),task(fg2,92,10),task(k1,42,0),task(k2,80,0),task(stop,104,0)].
@@	%! ! Error: Required minimal distance violated between mw3 and pg3

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