Radar Class
Terms
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- Two items that will effect stopping distance
- 1. Reaction time 2. Initial speed of vehicle
- What is Braking Distance?
- the distance it takes to stop once the brakes are applied.
- At what ages does alcohol related death occur.
- ages 6-27 AND IS THE NUMBER 1 CAUSE OF DEATH
- At what percentage dose speed contribute to death?
- 30% AND IS THE SECOUND CAUSE OF DEATH
- What is reaction time
- .75 to 1.5 seconds
- During reaction time the vehicle is __________ moving
- Still
- ___________ is the distance a vehicle travels in miles per hour
- Speed
- ___________ is the distance a vehicle travels in ft. per second.
- Velocity
- Velocity is calculated by multiplying the __________ by the __________ (1.4667)
- 1. vehicle speed 2. Constant
- Total stopping distance
- the combination of distance traveled during recognition time.
- Who sets speed limits
- City and State traffic engineers.
- Prima Facie speed limit
- 1. holds that a given speed limit is valid no its face. 2. however a valid defense may challenge whether the speed observed is unsafe. 3. this includes all speed limits set by city ordinances.
- Absolute speed limit
- holds that a given speed limit is in force regardless of environment factors, or conditions. - easily enforced.
- Basic speed limit
- holds that no person shall operate a vehicle in excess of a speed that is reasonable and prudent for existing conditions.
- What two types of radar
- 1. Pulse radar 2. Continuous wave radar
- What does Doppler radar do?
- 1. It gives precise speed measurements 2. transmits continuous wave and constant frequency.
- What is frequency
- number of waves sent out in one sec.
- What is the speed of light
- 186, 282.4 miles per sec.
- Police radar frequency are assigned and regulated by ______
- the FCC
- S-band
- no longer in use
- x-band
- not widely used
- k-band
- still widely used
- Ka-band
- most used.
- x-band freq.
- 10.525 wave length - 1.5
- k-band freq. and wave length
- 24.150 wave length 0.5
- ka-band freq.
- 33.4-36.000 wave length 3/8
- character of radar beams
- 1. reflected 2. refracted 3. absorbed