Editing Talk:2926: Doppler Effect
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In the UK, the primary emergency-vehicle (police, ambulance/paramedic, fire, coastguard, anything else {{w|Emergency vehicle equipment in the United Kingdom|similarly official}}; for road/off-road/air/water vehicles of all kinds) flashing light tends to be blue. There may be alternating reds too, according to vintage, but currently blue lights are the main feature (and 'battenburgs', on marked vehicles, according to the nature of the service involved). Non-emergency vehicles' 'beacons' would be amber, on anything underspeed/stopped/extraordinary on the carriageway (road-sweepers, flatbed car-recovery, exceptional load carriers/escorts) and I think green and red flashers are common for construction site traffic. Interestingly, the other day I saw a police car ''and'' an unmarked response car (going to the same incident, both flashing their blues), three ambulances (none obviously going to same incident, and only two with blues) and a fire-engine (not flashing, probably going back to base). Only one of them (an ambulance) was blaring its respective siren, though. I believe emergency drivers are required to use them sparingly/judiciously, rather than just put the blues'n'twos on and barge through. [[Special:Contributions/172.70.90.172|172.70.90.172]] 21:06, 29 April 2024 (UTC) | In the UK, the primary emergency-vehicle (police, ambulance/paramedic, fire, coastguard, anything else {{w|Emergency vehicle equipment in the United Kingdom|similarly official}}; for road/off-road/air/water vehicles of all kinds) flashing light tends to be blue. There may be alternating reds too, according to vintage, but currently blue lights are the main feature (and 'battenburgs', on marked vehicles, according to the nature of the service involved). Non-emergency vehicles' 'beacons' would be amber, on anything underspeed/stopped/extraordinary on the carriageway (road-sweepers, flatbed car-recovery, exceptional load carriers/escorts) and I think green and red flashers are common for construction site traffic. Interestingly, the other day I saw a police car ''and'' an unmarked response car (going to the same incident, both flashing their blues), three ambulances (none obviously going to same incident, and only two with blues) and a fire-engine (not flashing, probably going back to base). Only one of them (an ambulance) was blaring its respective siren, though. I believe emergency drivers are required to use them sparingly/judiciously, rather than just put the blues'n'twos on and barge through. [[Special:Contributions/172.70.90.172|172.70.90.172]] 21:06, 29 April 2024 (UTC) | ||
:Blue lights are actually common in most of Europe: https://en.wikipedia.org/wiki/Emergency_vehicle_lighting#Usage_by_country. The light of emergency vehicles is technically also effected by the Doppler Effect, though this is barely measurable at typical driving speeds. --[[Special:Contributions/172.71.160.32|172.71.160.32]] 09:36, 30 April 2024 (UTC) | :Blue lights are actually common in most of Europe: https://en.wikipedia.org/wiki/Emergency_vehicle_lighting#Usage_by_country. The light of emergency vehicles is technically also effected by the Doppler Effect, though this is barely measurable at typical driving speeds. --[[Special:Contributions/172.71.160.32|172.71.160.32]] 09:36, 30 April 2024 (UTC) | ||
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It appears to be sheer coincidence that sirens were relevant to the discussion, as Miss Lenhart does not actually seem to know that the same phenomenon is at work. --[[Special:Contributions/172.70.211.129|172.70.211.129]] 22:04, 29 April 2024 (UTC) | It appears to be sheer coincidence that sirens were relevant to the discussion, as Miss Lenhart does not actually seem to know that the same phenomenon is at work. --[[Special:Contributions/172.70.211.129|172.70.211.129]] 22:04, 29 April 2024 (UTC) | ||
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re: "Pew pew" still unexplained. Note that Miss Lenhart actually says "pyeew" not "pew". It's most likely not a reference to shooting, but to a siren signal that (to my knowledge) is particular to US ambulances. Sound effect in question at ~0:18 [https://www.youtube.com/watch?v=s5bwBS27A1g here]. [[Special:Contributions/172.70.46.241|172.70.46.241]] 07:52, 30 April 2024 (UTC) | re: "Pew pew" still unexplained. Note that Miss Lenhart actually says "pyeew" not "pew". It's most likely not a reference to shooting, but to a siren signal that (to my knowledge) is particular to US ambulances. Sound effect in question at ~0:18 [https://www.youtube.com/watch?v=s5bwBS27A1g here]. [[Special:Contributions/172.70.46.241|172.70.46.241]] 07:52, 30 April 2024 (UTC) | ||
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