I can't imagine the loss of business due to road design comes anywhere near to touching the monetary impact of car collisions on the road, be it property damage or personal injury, and whether you're in a car, on a bike, or on foot. Between 2019-2023 there were 294,302 collisions in Toronto involving at least 1 automobile, and that 5 year total is
low because of the effect Covid had on travel. 2014-2019 saw 366,663 car collisions.
In 2023 alone there were 66,863, and with 1388 involving at least one pedestrian, and to bring it back to cycling 1063 collisions involving at least one cyclist and one car. That's a lot of people who've potentially had to repair or replace a car or bike, seek medical care, take time off work, or deal with lasting pain or trauma as result of a crash. A
study released in 2024 stated that pedestrian and cyclist injuries are "severely underrepresented by police data", and found more than 30,000 ER visits for cyclist injuries between 2016-2021 -- TPS data only captured 2,362.
Of those 66k collisions, 46.5k are listed as involving property damage, so even if you assume it's just to one vehicle per crash and cap it at the minimum $2k threshold for reporting, that's a value of $93,000,000 in one year.
If a city could be sued successfully for their road design because of loss of business (money), how that wouldn't make a city far more risk adverse would be surprising. If that happened, wouldn't that just spur cities to enact slower speeds and change infrastructure to minimize their risk exposure?