Roadworks merge simulator
Lane 2 is closed ahead. See how the way drivers merge changes how many cars get through the roadworks.
Merging
Lane 2 drivers pick their own moment to move over. Fully right is a zipper merge: they stay in lane until the last 30 m, then merge in turn.
Lane 2 cars indicate when they want to merge. The lane 1 car beside or just behind decides once whether to drop back, and lets in at most one car. Lane 2 cars that have merged behave the same way.
Traffic
A fed-up grey stuck in a queue pulls out to straddle both lanes, so lane 2 cars behind can't pass. It never lets anyone in.
Playback
Stats reset automatically when you change a setting.
Through the roadworks measured over 0:00
Cars in the last minute (so far)
0
0 lane 1 0 lane 2
Average per minute
–
– –
Cars each grey lets in
–
average over greys that got through
Mean journey time
– –
from arriving to leaving, incl. waiting to enter
Waiting to enter
0 0
queue backed up past the left edge
Average merge point
–
before the cones · 0 blockers now
Cars through per minute
Lane 1 (grey) Lane 2 (red, green, blue) Arrival rate
The first bar appears once a full minute has been measured.
Show as table
| Minute | Lane 1 | Lane 2 | Total |
|---|