A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
Highway engineering covers the design of highways, in particular: layout (vertical and horizontal), surfacing design and drainage
For questions related to power (mechanical or electrical) generated from wind.
Questions relating to the historical development of an engineering practice or process. Also, questions about the people and places involved in significant engineering developments and achievements.
Questions about the design and operation of electric drive vehicles, especially on-road vehicles.
For questions about the design of circuits. This may cover everything from processing steps to models to high level circuit design issues.
Questions about solar applications that make use of the photovoltaic effect, especially solar panel and thin-film technologies.
Questions concerning problems which cannot be exactly solved, or where the exact solution may be much more difficult to acquire than a solution by numerical methods.
For engineering questions involving chemistry. For pure chemistry problems, please visit our sister site Chemistry Stack Exchange.
Servo is a tag used when referring to servo motors, electric motors capable of being programmed to turn in a desired way