Main Street, Clarkston traffic report · March 31–April 24, 2026
A dangerous pattern
after dark.
51.9% above 30 mph at night. 10.6% by day. The nighttime above-limit rate was nearly five times the daytime rate on Main Street in Clarkston.
These percentages compare recorded passage averages, not crash risk. The 77 mph peak is reported in radar monitor 305290’s original export.
30 mph posted limit25 monitored dates74,040 passages
See the full report.
Daily charts, hourly heatmap, and source data & method.
The results at a glance
Nighttime averages above 30
51.9%
4,113 of 7,920 passages. 10 PM–6 AM · 30 mph limit.
Main Street, Clarkston · Mar 31–Apr 24, 2026 · Monitor 305290SlowTheFoxDown.comLimit comparisons use recorded average speeds.
Night / day above-limit rate
4.9×
51.9% at night versus 10.6% by day, using recorded average speeds.
Main Street, Clarkston · Mar 31–Apr 24, 2026 · Monitor 305290SlowTheFoxDown.comLimit comparisons use recorded average speeds.
Highest recorded peak
77 mph
April 24 · 6:00–6:30 AM. Posted limit: 30 mph.
Main Street, Clarkston · Mar 31–Apr 24, 2026 · Monitor 305290SlowTheFoxDown.comRecorded peak, not an average. Source: radar monitor 305290.
Averaged above 30 mph
11,111
15.0% of all recorded passages across the full period.
Main Street, Clarkston · Mar 31–Apr 24, 2026 · Monitor 305290SlowTheFoxDown.comLimit comparisons use recorded average speeds.
Passage counts include repeat trips; the first and last dates are partial. Above-limit rates use each passage’s recorded average speed; the 77 mph figure is an interval peak.
The nighttime pattern
Nearly five times
the daytime rate.
From 10 PM to 6 AM, 4,113 of 7,920 recorded passages averaged above 30 mph. The nighttime mean was 30.7 mph, compared with 22.3 mph by day.
Nighttime
10 PM–6 AM51.9%
of recorded passages averaged above 30 mph
4,113 above 30 mph by average speed
out of 7,920 recorded passages
Main Street, Clarkston · Mar 31–Apr 24, 2026 · Monitor 305290SlowTheFoxDown.comLimit comparisons use recorded average speeds.
Daytime
6 AM–10 PM10.6%
of recorded passages averaged above 30 mph
6,998 above 30 mph by average speed
out of 66,120 recorded passages
Main Street, Clarkston · Mar 31–Apr 24, 2026 · Monitor 305290SlowTheFoxDown.comLimit comparisons use recorded average speeds.
These compare the share above 30 mph, using the same 0–100% scale. Daytime had more traffic and more above-limit passages in total: 6,998 versus 4,113.
Across the full period: 85% of passages averaged 30 mph or less, and the overall mean was 23.2 mph. Those combined figures do not describe the much higher nighttime above-limit rate.
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The full detail,
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Explore daily and hourly patterns, the speed heatmap, and the complete source and method.
What the data supports
These are observations from radar monitor 305290. They do not establish the sign’s effect or determine overall road safety.
The export’s above-30-mph average-speed counts reconcile on all 25 dates. Read the method and correction history.