Drivers naturally increase their vehicle speed on long and straight highways. Clear visibility of the road ahead makes some people drive recklessly. Engineers do not use dangerous curves just to control this speeding habit. Vehicles will lose control if drivers do not slow down at sharp turns. Planners install speed limits, warning boards, rumble strips, and speed breakers for safety instead. Road design, maintenance, and driver behavior matter more than just straight or curved paths.
Reducing construction costs
A straight road requires clearing every single obstacle in its path. The route might cut through residential areas, commercial buildings, industries, farmlands, or forests. Land acquisition, compensation payments, and environmental clearances increase the project budget massively. Engineers also need to build expensive bridges and tunnels for straight paths. Planners choose curved alternative routes to reduce costs, minimize environmental damage, and avoid public inconvenience. They calculate route length, soil type, bridge requirements, and land prices before finalizing the map.