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Well they might be but in all cases no. Acute angles just have to have an angle less than 90 degrees to be acute!
I'm not sure but i think it might be 4 acute angles but i suggest you try a more accurate site.
I am not sure I understand what you are asking. The formula you give is a parabola and the gradient of the curve is changing all the time. So please can you give more details about where this acute angle might be.
89 plus any fraction you might care to add. 90 is a right angle and greater than 90 would be obtuse.
The three things that traffic monitoring might measure are any fluctuation in the normal traffic, any special events that might cause an increase in traffic and the capacity that travels on the road and how much traffic it can handle. For example on quiet times or roads it can save money and time to turn off the traffic lights when not needed at particular times.