Speed humps and speed tables are effective speed reduction measures because

Speed humps and speed tables are effective speed reduction measures because they allow traffic to proceed at the speed limit.

Explanation:

Speed bumps and speed tables are effective in controlling the velocity on the streets in different ways, for example, speed bumps are effective in keeping vehicle speed down, the driver is forced to reduce the speed if he doesn't want his car to get a bit damage. On the other hand, speed tables are effective on the streets were keeping the speed limit is more important than slowing down cars.

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