There's speed limit
The Spanish phrase 'haber límite de velocidad' translates to 'there's a speed limit' in English. This is typically used in the context of driving or traffic rules, where a maximum speed at which a vehicle may legally travel is instituted to ensure safety on the road. Just like in English, this term is used to communicate to drivers that they must regulate their speed according to the set limit.
There should be a speed limit on all city streets.
This sentence is implying that the person speaking believes all city streets should have a defined speed limit to potentially reduce accidents or control traffic.
Why can't there be a speed limit on this rural road?
In this question, the speaker is questioning why there isn't a speed limit on this specific rural road. It's possible they feel it could be dangerous without one.
The fact that there is no speed limit does not mean that you should drive recklessly.
This sentence is stating just because there isn't a specified speed limit, it doesn't give someone the right to drive without caution. The speaker is communicating the importance of responsible driving.