A police time speed device, commonly known as a "time-distance speed measuring device," is utilized by law enforcement agencies to ascertain a vehicle's speed by analyzing the duration required to traverse a specific distance. This methodology is especially advantageous in scenarios where traditional speed measurement techniques, such as radar, lidar / laser, or pacing, may prove less effective, including areas with high traffic density or limited visibility conditions.

How Police Timing Devices Works?

Measurements:

Two or more markers are established.

Timing:

Target vehicle.

Determination Of:

Velocity

Advantages:

 Provides an alternative method of speed enforcement that can be effective in various conditions.

VASCAR (Visual Average Speed Computer and Recorder):

VASCAR (Visual Average Speed Computer and Recorder) is a specialized timing instrument employed by police or law enforcement agencies to measure the speed of vehicles.

How VASCAR Works:

Setup:

The officer identifies two cues.

Timing:

Vehicle

Key Features:

Visual Display:

VASCAR devices often have a visual display that shows the speed reading in real time. 

Portable:

Many VASCAR systems are portable, allowing officers to use them in different locations as needed.

Evidence Gathering:

VASCAR (some) can provide documented evidence.  

Advantages:

Interference:

In contrast to certain radar or lidar / laser systems, VASCAR operates efficiently even in high-traffic conditions.

Versatile:

It can be used in various environments, from urban areas to highways

Limitations / Errors:

Manual Operation

Average

Gap Time:

Using a gap time method for issuing a speeding ticket involves measuring the time of a targeted vehicle of two markers.



How Does Gap Time Work?

Steps to Issue a Speeding Ticket Using Gap Time:

Identify two or more cues

Timing:

Internal Calculation

Considerations:

Accuracy

Documentation

ENRADD:

Utilizes the same theoretical framework as gap time, but incorporates an automated functionality.

Data Display:

The device has a digital display that shows real-time speed readings. Officers can easily monitor speeds.

Key Features:

User-Friendly Interface

Remote Operation

Advantages:

Effective in Various Conditions

Some models can provide documentation for evidence.