Trigger: Wait for 2 DS to be hit in either High or Low. Bet the remaining single unhit DS.
Progression: From my RNG -casino table-limit for one DoubleStreet is 180. The negative progression will be 26-steps:
One DS: 1 1 1 2 2 3 4 5 6 7 9 11 14 18 22 27 31 37 45 55 67 82 97 115 136 164 200 240
I think it's very unlikley that single DS will not hit in 26 spins ?
it is very likily what it will not hit. Streets can sleep up to 60 spins, as someone said here.
Meanwhile... (spins before hit)
3 1 6 16 4 4 7 5 4 13
1 1 2 10 2 5 6 10 2 14
21 1 1 3 1 1 2 2 8 2
6 1 13 1 4 11 6 3 2 5
9 1 2 6 2 4 2 2 2 3
I tested this (playing as described) 50 spins, at most 21 spins before hit