Download FDLE 1158 Speed Measurement Exam 2025-2026 Questions And Answers Graded A+ and more Exams Automobile Engineering in PDF only on Docsity!
FDLE 1158 Speed Measurement Exam 2025-
2026 Questions And Answers Graded A+
The relationship between the driver, vehicle, roadway, and increased speed the operator's age, experience, abilities, roadway design, and the vehicle's overall mechanical condition are interdependent factors when dealing with speed The effect of speed on total stopping distance -the nationally recognized perception/ reaction time during normal daytime conditions for a non-impaired driver is 1.6 seconds, based upon an average drag factor of 0. Total stopping distance a combination of reaction time and braking distance. the higher the speed, the longer the stopping distance 85th percentile A traffic engineer's method of establishing speed limits. 85% of drivers drive at or below a speed that is comfortable for a given roadway, which is the basis upon which traffic engineers set the speed limit Major types of speed regulations
-basic speed law -absolute speed law Section 316.183, F.S. the basic speed law. no person shall operate a vehicle in excess of a speed that is safe and prudent for the conditions that exist at that time Absolute speed law A given speed limit that is in force at all times regardless of environmental conditions. Based on scientific studies and data Section 316.187, F.S. provides absolute speed law for state roads section 316.189, F.S. provides absolute speeds for municiple and county roads section 316.1895, F.S. provides absolute speeds in school zones the 2 effects of speed in motor vehicle crashes
parallax the apparent movement of a fixed object when the viewer changes their position how parallax can affect time-distance calculations by changing the percieved location of a reference point, thereby changing the calculated time and raising or lowering the speed calculation RADAR Radio Detection and Ranging what does a RADAR measure? distance and speed. it does this by transmitting radio waves at a target and measures how far away the target is and how fast it is moving.police traffic radar requires a moving target and does not measure the distance to the target radio waves transmitted by a police traffic radar device are characterized by -signal speed (speed of light) -wavelength -frequency signal speed The speed at which a radio wave travels, which is 186,282 miles per second, or the speed of light.
wavelength the distance from the beginning of a peak to the end of a valley of a radio wave frequency the number of individual waves transmitted in one second the basic doppler principle The scientific basis for police traffic radar. the 2 frequencies approved for use in florida -K band -Ka band Ka band 33.4-36.0 GigaHertz cycles per second for Ka band 99.6 to 105.4 cycles per second per one MPH
the stationary agular (cosine) effect -the angle created between the target vehicle and the radar -always lowers the displayed target speed reading 2 factors may affect the correct operation of stationary radar -scanning effect: the rapid swinging of a radar unit antenna causing an incorrect reading -panning effect: the pointing of the antenna of the radar device toward the counting unit, causing an incorrect reading elements involved in completing a tracking history in stationary radar include -visual estimation of target speed -audio doppler -target speed display two speed readings -low frequency doppler (your patrol speed) -high frequency doppler (moving vehicles speed) same direction moving radar a radar which determines speeds of target vehicles traveling in the same direction as the radar
the purpose of adjusting the radar sensitivity to eliminate unwanted signals such as interference ABCs antenna => box => current the requirements for testing a police traffic radar and laser devices -the agency is responsible for having the police traffic radar device tested every 6 months by an electronic technician who holds one of the certs specified in rule 15B- 2.009, F.A.C. the court holds the radar operator responsible for ensuring that this testing has been complete -in addition the radar operator is required to conduct daily tests. twice daily, before and after enforcement activity daily testing requirements of police traffic radar devices -the light test -the internal test -the tuning fork test -the speedometer test LIDAR Light Detection and Ranging
the name for the method of determining distance by traffic laser time of flight how laser devices determine the targets direction by evaluating whether the distance of the target from the laser is increasing or decreasing -if the distance is decreasing, the target is approaching (+) -if the distance is increasing, the target is receding (-) the average of least squares the mathematical process built into police traffic laser device by the manufacturer to eliminate inconsistent data sweep error An erroneous high or low speed reading caused by changing the targeting point while transmitting laser pulses. sweeping the movement of the laser, results in a gradual change in speed data, instead of sudden change
the laser operator is required to perform the following tests daily -the light test -the internal test -the distance test (100 feet) -the sight alignment test (at least 200 ft away) environmental conditions which can affect the ability to acquire a target -avoid aiming laser in the direction of the sun -lasers do not work in rain, fog, dust, or smoke what offense is it for pointing a laser at an aircraft federal felony offense the confidence of a traffic laser operator is based on several elements of tracking history -estimating each target vehicle's speed visually -ensuring that an audio tone was present indicating that a target was acquired -obtaining a correlated readout on the traffic laser device -confirming the targets direction of travel -identifying that the unit provides a readout of the distance measure factors that may affect the operation of police traffic laser devices -reflection error
honeycutt v. commonwealth requires that law enforcement officers be able to set up, test, and read a stationary radar device state v. hanson requires that an officer must have sufficient training in and experience using moving radar people v. depass the depass case challeneged that the officer was using the laser device improperly. the court ruled that the officer was certified and tested the device properly both before and after the citation was issued for a speed infraction you must prove -the official posted speed limit -the speed was in excess of the specified limit -the method used to obtain violator speed section 316. gives a LE officer the authority to arrest a person for a speeding offense that was detected using an electronic speed measurement device section 316.
provides the qualifications of an officer using speed measurement devices and the conditions under which those devices can be used the proper documents needed for court include -speed measurement device operators proof of training -6 month speedometer test cert (moving radar) -6 month test cert of the speed measurement device used -daily radar or testing log chapter 15B-2, F.A.C. requires radar and laser devices used in florida to recieve state testing and approval as well the regularly scheduled 6 month testing. laser operators must consistently observe safe operating practices when using police traffic laser devices, for example -never point the laser device at the eye, particular at close range, or look directly into the lens -do not use a police traffic laser device if the lens has been damaged. a cracked lens may change the eye safe classification of the laser -never point a police traffic laser device at an aircraft. doing so may distract the pilot at a critical point of operation of the aircraft
