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Having as few crossings as possible in road networks saves expenses on traffic lights and flyovers, significantly reduces noise and air pollution, and allows tr

Gerhard ringelBojan moharDavid johnsonKazimierz zarankiewiczMichael gareyPaul kainenJohn baptist gauciCheryl zerafa xuerebUniversity of maltaJunior collegeDepartment of mathematicsGraph theoryWorld warFrom turBaptist gauciMatt de vos