On-demand from customers AWD methods push the secondary axle by using an Lively or passive coupling system or "by an independently driven travel method". The typical notes that in some cases, the secondary drive technique could also deliver the primary auto propulsion. An illustration is usually a hybrid AWD car https://groupak.gr/%CE%BA%CE%B1%CF%80%CE%AC%CE%BA%CE%B9%CE%B1-%CE%BA%CE%B1%CF%81%CF%8C%CF%84%CF%83%CE%B1%CF%82/tek-%CF%81%CE%BF%CE%BB%CF%8C-%CE%B1%CE%BB%CE%BF%CF%85%CE%BC%CE%B9%CE%BD%CE%AF%CE%BF%CF%85