BC Speeding Tickets: Section 146(7) Explained

Question: A friend of mine just received a speeding ticket in BC. The description of the offence says "speed signs", the Act is "MVA", and the section is "146(7)". What does this mean? She doesn't think her actual speed was recorded on the ticket, but there are two numbers, "91-89", written in the top right corner. Lastly, if she disputes this ticket, can a judge increase her penalty?

Speeds considered excessive by residents are considered reasonable by these same persons when they are driving in another neighborhood. This observation is taken from a publication titled Speed Control in Residential Areas by the Institute of Transportation Engineers (ITE). It goes on to say that residents’ complaints are usually accompanied by a proposed solution to the speeding problem...stop signs.
When a vehicle is in yaw it is rotating around a vertical axis through it's centre of mass. The long, curved yaw marks left by the tires on the pavement were characteristic of this motion. If they were striated and of constantly diminishing radius they were of great interest for collision reconstruction because the vehicle's speed could be determined from them.
Question: The police officer used a radar gun to check my speed. According to him, there are no records for radar calibration on it. This is a real, live issue for my trial. If the radar gun does not have service records, then how do we know that it is functioning correctly?
Welcome to wet weather season in British Columbia! Some areas are blessed with this situation more often than others, but drivers need to be aware of the perils of wet highways. The well being of you and other road users depend on it.
Question: Our daughter failed her road test due to not reducing her speed to 30 km/h as she drove through a playground zone. We don't understand this because there were no signs were present.
Today was the first day back at school for elementary students where I live. The school is on an arterial road with a posted speed of 60 km/h that is often ignored by many drivers. I stood with speed watch volunteers for an hour from 10:00 to 11:00 am and was pleasantly surprised by what I saw.