There are signs for that. Advisory speeds that don't change the actual limit. https://wisconsindot.gov/PublishingImages/doing-bus/local-gov/traffic-ops/advisor

There are signs for that. Advisory speeds that don't change the actual limit. https://wisconsindot.gov/PublishingImages/doing-bus/local-gov/traffic-ops/advisory-speed-limit-signs-2.png https://wisconsindot.gov/PublishingImages/doing-bus/local-go... Much better to be specific than a vague "slow down". There's a road near me with two tight turns a couple blocks apart. One advises 25mph and the other advises 10mph.