The Crossrail 2 - a new rail link between south west and north east London - project has received overwhelming support from the public according to public consultation.
The Mayor of London has hailed the project as crucial in relieving congestion, boosting economic growth in the capital, and offering a vital interchange if the high speed HS2 national rail service goes ahead.
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George Michael died in December last year at the age of 53.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.
Those gathered on the bridge fell silent at 2.40pm - the time the first call was made to police exactly seven days ago.