I used to work for the streets department in the 80s. I learned that old concrete, asphalt can become worn as vehicles tires and grit "polish" the surface. This happens mostly in curves, corners and at stop signs or lights. A little dust on the "polished" area and it is easy to loose traction and low side. Especially with harder touring tires, although I do not know what kind of tire you have or how old they are.
I am glad you are alive. I hope you heal up quickly. Best wishes.
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