A couple of questions: Is there anywhere along this stretch of road which is a recognised accident black spot? Or have there been a series of accidents along this stretch of road in recent years?
If so then I think you have good reason to demand changes – if not then I think you’re going to have to come up with some hard evidence as to why this stretch of road might be considered dangerous.
Sure, it shouldn’t take an accident to prompt change, nor should speeding be tolerated, but I don’t think the council is going to be prepared to spend money without some hard evidence first. Personally feeling unsafe when walking along the pavement is not sufficient - If drivers are regularly speeding, then it needs to be monitored.
In my experience, speed humps only work when they traverse the full width of the road. (No gaps between them)