Editing Speed limit (section)

===Environmental considerations===
Speed limits can also be used to improve local air quality issues or other factors affecting [[environmental quality]]<ref name="Int Panis">{{cite journal|vauthors=Int Panis L, etal|year=2011|title=PM, NOX and CO2 emission reductions from speed management policies in Europe|journal=Transport Policy|volume=18|issue=1|pages=32–37|doi=10.1016/j.tranpol.2010.05.005}}</ref> (e.g. the "[[Speed limits in the United States#Environmental speed limits|environmental speed limits]]" in an area of [[Texas]]).<ref>{{cite web|url=http://www.tceq.state.tx.us/implementation/air/sip/speedlimit.html|title=Vehicular Speed-Limit Reduction|work=Texas Commission on Environmental Quality|year=2002|access-date=2010-04-13|url-status=dead|archive-url=https://web.archive.org/web/20100126004805/http://www.tceq.state.tx.us/implementation/air/sip/speedlimit.html|archive-date=2010-01-26}}</ref> The [[European Union]] is also increasingly using speed limits as in response to environmental concerns.<ref name="ec_speed" />
European studies have stated that, whereas the effects of specific speed reduction schemes on particulate emissions from trucks are ambiguous, lower maximums speed for trucks consistently result in lower emissions of [[Carbon dioxide|CO<sub>2</sub>]] and better [[fuel efficiency]].<ref name="Int Panis" />