Rockfall protection system can be either active or passive. The main function of rockfall protection is to prevent and control rocks and debris from falling.
We heslyfence have several netting and fence systm that can be used as rockfall protection systems. They're widely used in new developments and in areas where slopes have not been completely stabilized.
Rockfall protection is somewhat of an imperfect science that requires special skills and specific installation procedures. There are no real rules of thumb when you're using rockfall protection systems due to the atypical behavior of rocks and soil stabilization measures.