Average daily traffic on bridges that are structurally deficient and fracture critical. Graphic by Troy McQuillen Average daily traffic on bridges that are structurally deficient and fracture critical. Graphic by Troy McQuillen By Heidi Marttila-Losure October 16, 2012 Average daily traffic on bridges that are structurally deficient and fracture critical. Graphic by Troy McQuillen 2012-10-16 Heidi Marttila-Losure Share ! tweet