This map looks cool but it doesn't tell us a lot about the safe and unsafe places to cycle in London. Because it's based on collision data by location, but we don't know how many people cycle on each road per year, so can't normalise for that.

To compare two examples, you can pick out Richmond Park in south-west London due to the low number of collisions in it. But this is actually a highly popular location to cycle. The relatively low amount of vehicles, 20mph speed limit, ban on large vehicles, high visibility, and few junctions, makes it a great place to cycle.

There are also a low number of collisions in the boroughs of Bromley and Bexley in south-east London. But this is not because they're safe, but because very few people cycle there. There are loads of fast roads in these boroughs and little cycle infrastructure, and more of an hostile attitude from drivers compared to many other places in London.