Existing models and proposed alternatives...

[tradephoric]

https://www.youtube.com/watch?v=kQnaV1HDrjc

https://www.youtube.com/watch?v=oBCBguNB8PM

https://www.google.com/maps/@42.4965,-83.44663,652m/data=!3m1!1e3

[tradephoric]

https://www.youtube.com/watch?v=FlP9HMDjPa8

https://www.youtube.com/watch?v=wUrD4S2u8rQ

https://www.google.com/maps/@42.6030315,-83.289337,461m/data=!3m1!1e3

[tradephoric]

https://www.youtube.com/watch?v=iYWqbslCChU

https://www.youtube.com/watch?v=0v1QPaYISFA

https://www.google.com/maps?ll=42.56249,-83.15822&z=17&t=h

[tradephoric]

https://www.youtube.com/watch?v=kqfC3wjE6oc

https://www.youtube.com/watch?v=VUx6VwB1gSI

https://www.google.com/maps/@27.3890331,-82.449392,558m/data=!3m1!1e3

[tradephoric]

https://www.youtube.com/watch?v=TipNpo4eDPA

https://www.youtube.com/watch?v=LR2LSVBCsdE

https://www.google.com/maps/@28.18586,-82.35355,390m/data=!3m1!1e3