checkpoint
alarm
alarming
alert
announcement
attention
authority
blackandwhite
broadcasting
caution
cloudy
conceptual
czech
czechia
danger
dark
depressing
eastern
electronics
emergency
europe
industrial
isolated
loud
loudspeaker
media
megaphone
message
monochrome
noise
object
ostrava
overcast
propaganda
protect
republic
rural
security
siren
sound
speaker
surveillance
traffic
urban
urgency
urgent
warning