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fatsynatsy t1_ixbw3n2 wrote

Reply to comment by [deleted] in A 20 mph speed limit intervention implemented at city centre scale had little impact on short- or long-term outcomes for road traffic collisions, casualties and speed. by _DeanRiding

inappropriately drawn... as the sample size is too small to find a small effect with statiscal significance.

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[deleted] t1_ixcpk6h wrote

Because the amount of accidents in the first place is small. So reducing speed limit isint going to have an effect since the effect was so small in the first place.

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fatsynatsy t1_ixgrdio wrote

I see your point, but I would argue that no effect is still different from an effect which is functionally insignificant or outweighed by the inconvenience associated with a reduced speed limit.

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