Today, I did a local round trip of around four miles by car. Traffic was much lighter than on an average day - even though on a Sunday one gets stuck behind cars parked on yellow lines. Average speed was 14 mph.
Last week, I drove to Camden one morning, after the 9am school run had finished. I averaged 9mph. Parking cost me the best part of 10 quid.
Last time I drove locally at around 4:30 - 5pm, a short journey of a couple of miles took the best part of 45 minutes. I drive at this time (the perfect storm of the school run and end of work) very occasionally to validate my reasons for using the cycle.
I travel to Camden on my cycle at a much faster average speed. And I am an unfit cyclist on an old and heavy bicycle. The local average in my car today was about the same as my average on a cycle, and this was in traffic that didn't hinder me particularly.
Remind me again, how do bicycles hold up traffic?