What are the requirements for upgrading a driver's license?

[LeLeo]

Introduction to the conditions for upgrading a driver's license is as follows: 1. Application for adding a medium-sized bus driving license type: The applicant must have held a driving license for urban buses, large trucks, small cars, small automatic transmission cars, low-speed trucks, or three-wheeled vehicles for more than three years, and have no record of accumulating 12 penalty points in the last three consecutive scoring cycles before the application. 2. Application for adding a tractor driving license type: The applicant must have held a driving license for medium-sized buses or large trucks for more than three years, or have held a driving license for large buses for more than one year, and have no record of accumulating 12 penalty points in the last three consecutive scoring cycles before the application. 3. Application for adding a large bus driving license type: The applicant must have held a driving license for urban buses, medium-sized buses, or large trucks for more than five years, or have held a driving license for tractors for more than two years, and have no record of accumulating 12 penalty points in the last five consecutive scoring cycles before the application.