Redesigned D-Series motor graders from John Deere use event-based shifting that allows the operator to make directional changes without using the clutch. It also delivers smooth gear changes, eliminating automatic blade control over-correction problems associated with harsh shifts. Cab changes improve comfort, convenience and visibility and provide 26 percent more space and 40 percent more glass than previous models. Horsepower ranges from 185 to 245 using Deere's PowerTech engines. Low-effort hydraulic controls provide ease of operation for the blade, circle, wheel lean and other hydraulic functions. Estimated list price: $200,000 to $350,000.