An emergency vehicle is any vehicle that is authorized to respond to an emergency. Most emergency response vehicles are easy to see and hear because they are fitted with visual and audible warning devices.
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Check the brake fluid level, as on many vehicles the "emergency brake" (in the UK, Hand-brake) warning light also acts as a warning light for low brake-fluid.
Arthur I. Rubin has written: 'Emergency vehicle warning systems' -- subject(s): Emergency vehicles, Lighting, Sirens (Signaling devices)
Emergency vehicles should be given right of way all the time. They cannot control the intersection lights but carry their own different types of warning signalswhich can be purchased online at well known stores such as Prestige Emergency Lights and are responsible touse these lights wisely.
Not just ambulances, but many other emergency and police vehicles have a warning siren and flashing lights too. The lights and siren is to warn other road users ahead that a vehicle is on an emergency call and needs to get to the emergency as quickly as possible.
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A siren typically produces a loud, high-pitched wailing sound that is used as an alert or warning signal, often heard on emergency vehicles or in alarm systems.
The train whistle or the red warning lights flashing is the first warning signal of an approaching train on a level crossing. At many railroad crossings, the stop arm would be blocking access to crossing the tracks.
Road signs.
If the Coast Guard warns of a giant wave of water approaching the shore as a result of a major earthquake, they are warning of...... a tsunami
Diaster warning, attack warning, and all clear.