6. As the cross reference is completed, an updated alert is relayed to Champaign Police with a narrowed geographical location, and available officers are immediately dispatched to the specified location to investigate.

DoNot Use Signprintable PDF

These signs denote that the road is only for traffic coming in the opposite direction. Used at intersections to roads with one-way traffic or ramps.

Sounding vehicle horns is not allowed for vehicles in some areas, most commonly in school zones, villages, or near hospitals or churches.

Equipmentnot in Use Sign

Either for all vehicles or with some exceptions (emergency vehicles, buses). These are usually to speed up traffic through an intersection or due to street cars or other rights of way or if the intersecting road is one-way. Indicated near-universally by an arrow making the prohibited turn overlaid with a red circle with an angular line crossing it.

Overtaking is prohibited either for all vehicles or for certain kinds of vehicles only (e.g. lorries, motorcycles). In the USA, this is usually phrased as "no passing zone" and indicated by a rectangular, black-on-white sign on the right side of the road that says "DO NOT PASS", and/or by a solid yellow line painted on the roadway marking the left limit of traffic (centerline), and sometimes supplemented by a yellow (no passing zone) sign on the opposite side of the road (where it can be seen by a driver who is attempting to pass). Conversely, where the passing restriction is lifted, a rectangular, black-on-white sign that says "PASS WITH CARE" is placed on the right side of the road, and/or the yellow centerline changes from solid to broken (indicating that passing is allowed in that direction).

5. Simultaneously, the system cross-references detections from other nearby gunshot detection units. Using calculations based upon the time delays between units hearing the sound, the system is able to determine the approximate location of the incident. The vendor asserts that this automated process determines the location with a 90% accuracy to within 90 feet.

3. Audio suspected to be gunfire is uploaded to Flock Group, Inc. processing systems. These systems reprocess the audio to ensure that the sound was a gunshot and not a similar sound like fireworks or a car backfiring.

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Gunshot detection units capture short audio clips of their surroundings, interpret that audio to detect specific sound patterns, and, ultimately, alert an officer when the system has captured the sound of a potential gunshot. The automated process of capture, analysis, and comparison typically takes seconds, and officers are alerted to the vicinity of the gunshots.

This sign is used where parking is prohibited. Usually shown as a red diagonal bar inside a blue circle with a red ring in Europe and parts of Asia, and a 'P' in a red circle with a cross through in North and South America, elsewhere in Asia, Australia, Africa and Ireland. The no parking sign is a part of controlled parking zone sign, which is obsolete in Belgrade from 1997.[citation needed]

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The below resources, including FAQ and policy documents, are provided to give residents a greater awareness of gunshot detection functions and limitations and CPD’s guidelines around use, privacy, and data storage.

Used to indicate a maximum permissible speed. Speed limits are posted in kilometres per hour in most countries; however, the United Kingdom and United States use miles per hour. Motorists are expected to be aware of this, as the majority of speed limit signs display only a number and no specific units, although some countries' signs do display the unit as well. In Canada, the first sign in a sequence will display km/h and subsequent signs often will omit the unit.

DoNot use Signprintable

Used to denote that a previously posted speed limit is no longer in effect. Statutory state, local, or national speed limits usually govern speed after this point, unless another limit is signposted.

The Champaign Police Department has contracted with Flock Group, Inc. to install Raven gunshot detection technology for use in select areas of the community on a trial basis. In total, 33 units were installed in Champaign in the Winter of 2022. The initial authorization for gunshot detection units is for a period of one year. Following a review of the pilot program, Champaign Police discontinued the use of gunshot detection technology on February 12, 2024.

Traffic is not permitted to continue straight, and must usually turn. These may occur at an intersection with incoming one-way traffic.

This sign is used where parking and stopping is prohibited. Usually shown as a red cross inside a blue circle with a red ring in Europe and parts of Asia, and a 'E' in a red circle with a X through in South America.

No admittance to unauthorised personnel, usually shown as a red circle with a white rectangle across its face. It is often used for one-way traffic.