The Netherlands experiences the first car-free Sunday caused by the <a href="https://en.wikipedia.org/wiki/1973_oil_crisis" id="mw6g" rel="mw:WikiLink" title="1973 oil crisis">1973 oil crisis</a>. Highways are used only by <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Cyclist" id="mw6w" rel="mw:WikiLink" title="Cyclist">cyclists</a> and <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Roller_skaters" id="mw7A" rel="mw:WikiLink" title="Roller skaters">roller skaters</a>.