How should the two 4-count gates be handled in Car Sort Level 247?

Tap lower-left once, then lower-right once on each pass; keeping them synchronized prevents the 12-space road from filling.

Which pair dispatches last in Car Sort Level 247?

The upper-right green pair; cyan and green then drain together from 8/12 to reach 0/12.

Car Sort level guide

expert 11 colors

Car Sort Level 247 begins with a yellow pair at 2/12 and advances two lower 4-count gates in lockstep before cyan and green drain from 8/12.

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Tap right-side yellow, center-row 1, center-row 2, then center-row 3.
Tap upper-left, upper-second, upper-third, then upper-right.
Tap lower-left 4 and lower-right 4 once each, then lower-middle.
On the second center-row pass, tap the revealed row 1 blue, row 2 pink, and row 3 purple, then right-side.
Tap upper-left, upper-second, upper-third, then upper-right.
Tap lower-left 4, lower-right 4, then lower-middle brown.
On the fourth center-row pass, tap row 1 blue, row 2 pink, and the revealed row 3 yellow, then right-side cyan.
Tap lower-left 4, lower-right 4, then lower-middle after their last rows expose.
On the fifth center-row pass, use row 1 blue, row 2 pink, and the revealed row 3 lavender.
Tap upper-left purple, upper-second orange, upper-third red, right-side cyan, then upper-right green as the final dispatch.
Make no further tap while cyan and green enter from 8/12 to reach 0/12.

Colors in this level:

Yellow, Lavender, Pink, Purple, Cyan, Brown, Red, Blue, Green, Orange, White

Board notes 5 details

Layout: Four upper boxes, three long center rows numbered 1 through 3 from top to bottom, one right-side box, and three lower boxes feed a 12-space loop.
Goal: Receive the starting yellow pair, then keep the two lower countdown boxes synchronized.
Opening: Tap right-side yellow, center-row 1, center-row 2, then center-row 3.
Danger Zone: Exhausting one 4-count gate while the other remains covered can strand mismatched colors at 12/12.
Mechanics: Lower-left and lower-right each have a 4 countdown. Center rows 1/2/3 reveal blue/pink/purple on pass two, blue/pink/yellow on pass four, and blue/pink/lavender on pass five. Question tiles are covers, with no key or numbered source.

How should the two 4-count gates be handled in Car Sort Level 247?
Tap lower-left once, then lower-right once on each pass; keeping them synchronized prevents the 12-space road from filling.
Which pair dispatches last in Car Sort Level 247?
The upper-right green pair; cyan and green then drain together from 8/12 to reach 0/12.