year
| 1961 or 1962 |
day
| of year |
limit
| was there a speed limit? |
y
| traffic accident count for that day |
j
in 1962 was comparable to day j
in 1961. On some days
the speed limit was in effect and enforced, while on other days
there was no speed limit and cars tended to be driven faster.
The speed limit days tended to be in contiguous blocks.