Volvo Truck Corporation Date Group No. Release Page Service Bulletin 12.05 175 09 18 4(47) Predominantly flat (PF) Uphill and downhill stretches with: gradients >3% for up to 20% of total mileage. gradients >6% for up to 1% of total mileage. Maximum gradients 16%. T1008403 Hilly (H) Uphill and downhill stretches with: gradients >3% for up to 35% of total mileage. gradients >6% for up to 10% of total mileage. gradients >9% for up to 1% of total mileage. Maximum gradients 20%. T1008404 Very Hilly (VH) Typically mines, building sites etc T9008082 Abbreviations in brackets are used in the EOC table.