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.