Detroit downtown circuit (WIP thread)

[checkpoint10]

I'm doing a quick survey of the track to get familiar with the layout. Detroit has 17 turns - I'm going to call these T1...T17. The straight sections between turns I will call S1/2 (meaning section between T1 and T2) and so on.

Now I measure the track width on Google Earth (based on recent imagery and 12/2002 aerial where noted):

S1/2 - Atwater St - 44' (possibly as narrow as 39')
S2/3 - St. Antoine - 54' (need to check if it was this wide in 1991), 40' (past Franklin St) - uphill with ~15' gain in elevation; based on 12/2002 aerial - 33' to 40' wide
S3/4 - Woodbridge St - 37' (further 5' gain in elevation around this section)
S4/5 - Jefferson Ave - 36'
S5/6 - Chrysler Dr - 36'
S6/7 - Congress St E - 45'
S7/8 - Beaubien St - 32' (perhaps expanding to 44' - to check if circuit used the left turn lane)
S8/9 - Larned St - 40'
S9/10 - Woodward Ave - 45'
S10/11 - W Jefferson Srv Rd - 36' (32' based on 12/2002 aerial)
S11/12 - Washington Blvd - 38' (maybe narrower) / narrows to 32' before T12
S12/13 - Parking access ramp - 32' - goes downhill around 20'
S13/14 - Civic Center Dr - 39' (as of 12/2002)
S14/15 - Civic Center Dr - 38'
S15/16 - Atwater St and Tunnel - 40'
S16/17 - Atwater St chicane - 40'
S17/1 - Front straightaway in parking lot (probably wider)

Will need to compare against older photos and aerials but it's a start. I will update this post as I find more information.

There's a fairly good write-up of the circuit here: https://f1.fandom.com/wiki/Detroit_Street_Circuit