A diagram of a frontage road. The frontage road (grey) runs parallel to the motorway (black), allowing local residents access to the motorway while discouraging other road users from driving through the residential area.
<a href="//commons.wikimedia.org/wiki/User:Smurrayinchester" title="User:Smurrayinchester">Smurrayinchester</a>
<span class="int-own-work" lang="en">Own work</span>