In an industry where the ability to guide a vehicle without human hands has become a measure of a company's future, Hyundai Motor has announced it will develop its own driver-assist technology for deployment by 2029. The decision marks a deliberate turn away from dependence on outside suppliers, reflecting a conviction shared by many major automakers that autonomous driving is too consequential to be left to others. Like nations that once chose to build their own steel rather than import it, Hyundai is betting that control over this foundational technology will determine who leads the next era