In a surprise Easter update, Image Space Incorporated has released some experimental off-road content for rFactor 2, including a playable Interceptor Quad bike and Lost Valley dirt track to ride it on.
Dirt vehicles for rFactor 2 have apparently been a common request by the community, so Image Space Incorporated decided to release the off-road content as an experiment to showcase how it can be applied to the current rFactor 2 engine. The team is also apparently working on supporting loose dirt / soft terrain modelling in a future update.
Download links for the Interceptor Quad and Lost Valley track can be found here.