21.   The traffic on the approach road slowed to a crawl.

22.   The flood of cars has now slowed to a trickle.

23.   Sales have slowed to a trickle in recent weeks.

24.   The flow of water slowed to a trickle.

25.   Near the construction site, traffic had slowed to a crawl.

26.   Processing had slowed to a crawl.

27.   He slowed to almost nothing, but still the low-slung car needed guiding around each pothole and over every lump.

28.   Eventually the car slowed to a halt.

29.   While he was still undecided as to what to do a bus appeared round the corner and slowed to a halt near by.

30.   He slowed almost to a halt.