It also occurred to planners that RPVs could be used for photographic and electronic reconnaissance. One result of this idea was the AQM-34 Firebee, a modification of a standard U.S. target drone built in various versions since about 1951 by the Ryan Aeronautical Company. First flown in 1962, the reconnaissance Firebee saw extensive service in Southeast Asia during the Vietnam War. It was also used over North Korea and, until rapprochement in 1969, over the People’s Republic of China. A swept-wing, turbojet-powered subsonic vehicle about one-third the size of a jet fighter, the AQM-34 penetrated heavily defended areas at low altitudes with impunity by virtue of its small radar cross section, and it brought back strikingly clear imagery. Firebees fitted with receivers to detect electronic countermeasures returned intelligence about Soviet-built surface-to-air missiles that enabled American engineers to design appropriate detection and jamming equipment.

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This placard indicates a long commercial vehicle, which is a double trailer and can be up to 40 metres in length. It is important to be able to recognize an LCV on the highway, based on rear signage, and anticipate both the extended length and limited speed when preparing to pass one on the highway.

These signs warn of dangerous or unusual conditions ahead such as a curve, turn, dip or sideroad. They are usually diamond-shaped and have a yellow background with black letters or symbols.

This sign on the back of transit buses serves as a reminder to motorists of the law requiring vehicles approaching a bus stopped at a dedicated Bus Stop to yield to the bus, once the bus has signalled its intent to return to the lane.

The earliest UAVs were known as remotely piloted vehicles (RPVs) or drones. Drones were small radio-controlled aircraft first used during World War II as targets for fighters and antiaircraft guns. They fell into two categories: small, inexpensive, and often expendable vehicles used for training; and, from the 1950s, larger and more sophisticated systems recovered by radio-controlled landing or parachute. The vehicles were typically fitted with reflectors to simulate the radar return of enemy aircraft, and it soon occurred to planners that they might also be used as decoys to help bombers penetrate enemy defenses. (High-performance drones are still developed—for example, to test systems designed to shoot down antiship cruise missiles.)

These signs change according to traffic conditions to give drivers current information on delays and lane closures ahead.

Warning sign

These signs give a direction that must be obeyed. They are usually rectangular or square with a white or black background and black, white or coloured letters. A sign with a green circle means you may or must do the activity shown inside the ring. A red circle with a line through it means the activity shown is not allowed.

Do not stand in the area between the signs. This means you may not stop your vehicle in this area except while loading or unloading passengers. (Used in pairs or groups.)

Stop sign

This sign warns you that you are coming to a hidden school bus stop. Slow down, drive with extra caution, watch for children and for a school bus with flashing red lights.

These signs warn of unusual temporary conditions such as road work zones, diversions, detours, lane closures or traffic control people on the road. They are usually diamond-shaped with an orange background and black letters or symbols.

Indicates an upcoming fire truck entrance on the right and vehicles should be prepared to yield to fire trucks entering the roadway.

Watch for these signs when driving in designated bilingual areas. Read the messages in the language you understand best. Bilingual messages may be together on the same sign or separate, with an English sign immediately followed by a French sign.

A railway crossing sign is X-shaped with a white background and red outline. It warns that railway tracks cross the road. Watch for this sign. Slow down and look both ways for trains. Be prepared to stop.

The speed limit in this zone is lower during school hours. Observe the speed limit shown when the yellow lights are flashing.

These signs, above the road or on the pavement before an intersection, tell drivers the direction they must travel. For example: the driver in lane one must turn left; the driver in lane two must turn left or go straight ahead; and the driver in lane three must turn right.

These signs mean lanes are only for specific types of vehicles, either all the time or during certain hours. Different symbols are used for the different types of vehicles. They include: buses, taxis, vehicles with three or more people and bicycles.

The share the road sign is used to warn motorists that they are to provide safe space on the road for cyclists and other vehicles. This sign also warns motorists and cyclists to exercise additional caution on the upcoming section of road.

A yield sign is a triangle with a white background and a red border. It means you must let traffic in the intersection or close to it go first. Stop if necessary and go only when the way is clear.

Transactions and all other contact between you and other Members, Vendors or Users are conducted entirely at your own risk.

Please Form A Line temporary sign. For those that need to venture out these signs will help assist customer on where to form lines. There is also a reminder ...

The advantages of strategic UAVs notwithstanding, the emergent technologies described above were first exploited in war by Israeli battlefield UAVs. The first of these was the Tadiran Mastiff, a twin-boom aircraft introduced in 1975 that resembled a large model airplane weighing just over 90 kg (200 pounds) with a boxy fuselage and a pusher propeller driven by a small piston engine. It could be catapulted from a truck-mounted ramp, launched by rocket booster, or operated from a runway. The Mastiff and the larger but similar Scout, produced by Israeli Aircraft Industries (IAI), proved effective in identifying and locating surface-to-air missiles and marking them for destruction during hostilities in Lebanon in 1982. The U.S. Marine Corps procured the Mastiff, and it followed up this vehicle with the IAI-designed and U.S.-built RQ-2 Pioneer, a slightly larger vehicle with secure up- and downlink. The Pioneer, fielded in 1986, was used by the Marine Corps and Navy in the Persian Gulf War of 1990–91. Meanwhile, the U.S. Army promoted the development of a similar but still larger UAV, the Israeli-designed RQ-5 Hunter, which had a gross weight of 1,600 pounds (720 kg) and was propelled by both pusher and tractor propellers. Although not procured in quantity, Hunters served in the 2003 invasion of Iraq.

Various exit signs are used on freeways. In urban areas, many exit ramps have more than one lane. Overhead and ground-mounted signs help drivers choose the correct lane to exit or stay on the freeway.

US trafficsigns

Police1's Police Grants section provides a comprehensive database of grants, news, information and resources to help law enforcement agencies identify and ...

Sometimes one or more lanes may lead off the freeway. The arrows matching the exit lanes are shown on the advance sign in a yellow box with the word ‘exit' under them.

UAVs are aircraft that are guided autonomously, by remote control, or by both means and that carry some combination of sensors, electronic receivers and transmitters, and offensive ordnance. They are used for strategic and operational reconnaissance and for battlefield surveillance, and they can also intervene on the battlefield—either indirectly, by designating targets for precision-guided munitions dropped or fired from manned systems, or directly, by dropping or firing these munitions themselves.

Roadsignsin Hong Kong

Divided highway begins: traffic travels in both directions on separated roads ahead. Keep to the right-hand road. Each road carries one-way traffic.

Some informa­tion signs include a numbering system along the bottom of the sign to assist emergency vehicles and drivers in determining an appropriate route.

Sharp turn or bend in the road in the direction of the arrow. The checkerboard border warns of danger. Slow down; be careful.

Traffic signs give you important information about the law, warn you about dangerous conditions and help you find your way. Signs use different symbols, colours and shapes for easy identification.

Freeway interchanges or exits have numbers that correspond to the distance from the beginning of the freeway. For example, interchange number 204 on Highway 401 is 204 kilometres from Windsor, where the freeway begins. Distances can be calculated by subtracting one interchange number from another.

Only public vehicles such as buses, or passenger vehicles carrying a specified minimum number of passengers, may use this lane.

Locate Your Fire Extinguisher in Smoke, Fog and the Dark This 4"x17" fire extinguisher sign, enables you to locate the fire extinguisher in the dark with ...

EDR signs are used during the unscheduled closure of a provincial highway when OPP detour all traffic off the highway. The EDR markers are located along alternative routes and provide direction to motorists around the closure and back onto the highway.

This three-line led sign displays 3 rows of text messages. Ultra-bright led lights are reliable and will deliver your safety warnings and information to the ...

These signs tell you about distances and destinations. They are usually rectangular with a green background and white letters. Other signs with different colours guide you to facilities, services and attractions.

These signs warn of a school crossing. Watch for children and follow the directions of the crossing guard or school safety patroller.

Truck entrance on the right side of the road ahead. If the sign shows the truck on the left, the entrance is on the left side of the road.

This sign is installed on multi-lane highways with no centre median divider. It informs drivers approaching from both directions that they must stop for a school bus when its signal lights are flashing.

WorldVue Digital Signage is easily integrated into in-room entertainment platforms to deliver content directly to in-room televisions. Digital signage is an ...

The next wave of UAV development is likely to be so-called uninhabited combat air vehicles (UCAVs). If the experimental Boeing X-45 and Northrop Grumman X-47 are representative of these vehicles, they will resemble small B-2 Spirit stealth bombers and will vary in size from one-third to one-sixth the gross weight of a single-seat fighter-bomber. They will most likely supplement or even replace piloted fighter-bombers in the attack role in high-threat environments. Finally, large, extremely light solar-powered “endurance UAVs” have been flown in order to test the feasibility of communications and surveillance vehicles that would stay on station at high altitude for months or even years at a time.

The “slow-moving vehicle” sign is an orange triangle with a red border. It alerts other drivers that the vehicle ahead will be travelling at 40 km/h or less. When on a road, farm tractors, farm implements/machinery, and vehicles not capable of sustaining speeds over 40 km/h must display the slow moving vehicle sign. Watch for these slow moving vehicles and reduce your speed as necessary.

Pavement has been milled or grooved. Your vehicle's stopping ability may be affected so obey the speed limit and drive with extra caution. Motorcyclists may experience reduced traction on these surfaces.

Road sign

A stop sign is eight-sided and has a red background with white letters. It means you must come to a complete stop. Stop at the stop line if it is marked on the pavement. If there is no stop line, stop at the crosswalk. If there is no crosswalk, stop at the edge of the sidewalk. If there is no sidewalk, stop at the edge of the intersection. Wait until the way is clear before entering the intersection.

Following the lead of Israel, the United States has aggressively developed UAVs. The most important UAV in operational use is the General Atomics MQ-1 Predator, powered by a piston engine driving a pusher propeller. The Predator entered service in 1995 and, after initial problems, developed into a capable surveillance craft carrying a wide variety of optical, infrared, electronic, and radar sensors. The first operational use of armed UAVs involved Predators carrying antitank missiles and operated by the Central Intelligence Agency during the 2001 invasion of Afghanistan. However, Predators are operated mainly by the U.S. Air Force, often to locate and mark targets for heavily armed fighter-bombers or gunships. Supplementing the MQ-1 is General Atomics’ MQ-9 Reaper, a larger version of the Predator powered by a turboprop engine. The Reaper can carry some 3,000 pounds (1,360 kg) of ordnance and external fuel and has a significantly higher service ceiling than the Predator. It entered operations over Afghanistan in the autumn of 2007. Predators and Reapers have been purchased by allies of the United States, notably the United Kingdom.

Traffic light

This sign reserves curb area for vehicles displaying a valid Accessible Person Parking Permit picking up and dropping off passengers with disabilities.

Describes how to pair the Rift Touch Controllers.

AQM-34s operated with the limitations of 1960s technology: they carried film cameras, were launched from underwing pylons on a C-130 Hercules transport plane, and were recovered by parachute—snagged from the air by a harness hung from a helicopter. The full advantages of UAVs were to remain unexploited on a large scale until the 1980s, when reliable miniaturized avionics combined with developments in sensors and precision-guided munitions to increase the capabilities of these vehicles dramatically. One critical development was small high-resolution television cameras carried in gimbaled turrets beneath a UAV’s fuselage and remotely controlled via a reliable digital downlink and uplink. Often, the vehicles also carried a laser designator for homing munitions. Global positioning system (GPS) sensors provided precise location information for both the UAVs and their guided munitions. Employing these new technologies, the United States has fielded strategic-range UAVs, using communications satellites to relay control signals and sensor readouts between UAVs and control centres over global distances. For instance, in 2003 Ryan (which had been purchased by Teledyne, Inc., in 1968 and by Northrop Grumman Corp. in 1999) produced the first of a series of RQ-4 Global Hawk UAVs. The Global Hawk is capable of carrying a wide array of optical, infrared, and radar sensors and takes off from and lands on a runway. Its service ceiling of 65,000 feet (20,000 metres), its relatively small size, and the reach of its sensors render it effectively immune to surface-based defensive systems. Prototype Global Hawks were pressed into wartime use over Afghanistan in 2002 and over Iraq as early as 2003. They are currently the most important strategic-range UAVs in service.

Hovering UAVs have entered service—for example, the U.S. Honeywell RQ-16 T-Hawk, a ducted-fan vehicle weighing 18.5 pounds (8 kg), fielded in 2007 and used to locate improvised explosive devices, and the Russian Kamov Ka-137, a 280-kg (620-pound) helicopter powered by coaxial contrarotating blades and carrying a television camera for border patrol. The much larger Northrop Grumman MQ-8 Fire Scout, a 3,150-pound (1,420-kg) single-rotor craft resembling an unmanned helicopter, has been operational with the U.S. Navy since 2009; it was first used in anti-drug-smuggling operations off the coasts of the United States.

A school zone sign is five-sided and has a fluorescent yellow/green background with black symbols. It warns that you are coming to a school zone. Slow down, drive with extra caution and watch for children.

Indicates areas where the community has identified that there is a special risk to pedestrians. Traffic related offences committed within the zone are subject to increased fines.

Do not stop in the area between the signs. This means you may not stop your vehicle in this area, even for a moment. (Used in pairs or groups.)

Two roads going in the same direction are about to join into one. Drivers on both roads are equally responsible for seeing that traffic merges smoothly and safely.

All major military powers and even some militia groups employ battlefield surveillance UAVs to extend the view of ground and naval forces and to enhance the reach and accuracy of their supporting fire. For example, in its conflict with Israel, the Lebanese group Hezbollah has used the Iranian-built Ababil (“Swallow”), a vehicle with a wingspan of 3.25 metres (10 feet 8 inches) that is powered by a pusher propeller and launched either from a truck-mounted pneumatic launcher or by a booster rocket. Tactical surveillance craft range in sophistication from vehicles that, like the Ababil, loiter over battlefields acquiring and designating targets to hand-launched “mini-UAVs” carrying a single visible- or infrared-spectrum television camera. An early example of the latter is the U.S. AeroVironment FQM-151 Pointer, a UAV weighing less than 10 pounds (4.5 kg) and resembling a powered model sailplane. The Pointer first saw service with the U.S. Marine Corps in the Persian Gulf War. It is being replaced by the Puma, a development of the Pointer with more-advanced sensors, by the RQ-11 Raven, a scaled-down version of the Puma, and by the Wasp, a tiny vehicle weighing about 1 pound (less than half a kilogram) with a wingspan of 2 feet 4.5 inches (72 cm); the last is being issued to air force ground combat control teams as well as marines down to the platoon level.

Roundabout Ahead. Reduce Speed. The counter-clockwise arrows show the direction of vehicle traffic within the roundabout.

An oil skimmer is a machine that removes floating oil and grease from liquid. The floating oil adheres to skimming media, such as a belt, tube, rope, mop, or ...

The Ministry of Transportation strives to be a world leader in moving people and goods safely, efficiently and sustainably to support a globally competitive economy and a high quality of life.

Do not park in the area between the signs. This means you may not stop your vehicle except to load or unload passengers or merchandise. (Used in pairs or groups.)

In probe mode the Taser® shoots probes from a cartridge attached to the front of the Taser®. The probes are tipped with a short dart that has a small barb ...

In 1997 the U.S. Defense Advanced Research Projects Agency (DARPA) began to fund feasibility studies of extremely small “micro UAVs” no larger than 6 inches (15 cm). These studies (and similar studies conducted since 2003 in Israel) have produced a bewildering variety of designs powered by electric motors or tiny gas turbines the size of a watch battery, but no publicly acknowledged use has yet been found for them.