for all people saying what they were doing when they were young while crime rate was higher - was also the traffic higher or lower? it's rhetorical question, I

for all people saying what they were doing when they were young while crime rate was higher - was also the traffic higher or lower? it's rhetorical question, I have zero worries about kidnappings and other reasons regarding my children but when i see how are people driving and how big it's the traffic i am worried at what age i will let my children walk by themselves i was actually thinking about letting my 3yo go to kindergarten by himself as teaching him independence since it's like 100m walk, but there is one road to cross and most importantly he is too weak to open door on both buildings, will see if he will be stronger by age 5-6 :)