what does pedestrianization mean in this context?
Banning all traffic except buses and cycles during peak shopping times, Liberal Democrat members of the London Assembly proposed the street should be pedestrianised by 2020
Oxford Street
From 2005 to 2012, Oxford Street was closed to motor traffic on VIP Day, (Very Important Pedestrians), a Saturday before Christmas. The scheme was popular and boosted sales by over £17m in 2012 but in 2013, the New West End Company announced that the scheme would not go ahead as it wanted to do "something new". In 2014, Liberal Democrat members of the London Assembly proposed the street should be pedestrianised by 2020.

In 2006, the New West End Company and the Mayor of London, Ken Livingstone, proposed to pedestrianise the street with a tram service running end to end. The next Mayor, Boris Johnson, elected in 2008, announced that the scheme was not cost effective, too disruptive and would not go ahead. In response to a request from Johnson, Transport for London (TfL) reduced bus flow by 10% in both 2009 and 2010. The New West End Company called for a 33% reduction in bus movements.

In 2014, TfL suggested that pedestrianisation may not be a suitable long-term measure due to Crossrai
where is oxford street? City of Westminster, West End of London, England what is it? A major road what kind of pollution issues does it face? Nitrogen dioxide pollution
wiki:11710159
Oxford Street [SEP] Pedestrianisation
From 2005 to 2012, Oxford Street was closed to motor traffic on VIP Day, (Very Important Pedestrians), a Saturday before Christmas. The scheme was popular and boosted sales by over £17m in 2012 but in 2013, the New West End Company announced that the scheme would not go ahead as it wanted to do "something new". In 2014, Liberal Democrat members of the London Assembly proposed the street should be pedestrianised by 2020. In 2006, the New West End Company and the Mayor of London, Ken Livingstone, proposed to pedestrianise the street with a tram service running end to end.