The bridge over the Töss 1838 in Bruni, now Tössallmend Neftenbach, made this river transitional weather independent. This cleared the way for the road Pfungen - Embrach - Rorbas. A stone bridge over the river at Rorbas was built in 1840. The "Kohlenschwärze" (the slippery moist forest on the northern slope of the Blauen over the Töss River) is a geological, hydrological problem area since the Middle Ages, always leading to file entries. The road there could only be completed by 1850.