Because the costs of those measures are not worth the gain. If you have a million commuters on the streets, each taking a total of an hour a day for their comm

Because the costs of those measures are not worth the gain. If you have a million commuters on the streets, each taking a total of an hour a day for their commute, 20 days per month, increasing the average commute time by just 1% effectively costs >300 lives per year. The basic rule of any change you want to make to the system is that speeds need to go up, not down. Better AI assist systems help speeds go up, therefore they reduce the cost of commuting in human lives.