self-contained, hand-held, electronic, LED-based, user-controlled, textual, safety alert sign used by traffic safety personnel to convey selected traffic-directing messages to motorists at construction sites or roadblocks, and during event let-outs, and office/plant shift changes

'alert':16 'base':10 'chang':46 'construct':33 'contain':3 'control':13 'convey':24 'direct':28 'electron':7 'event':39 'hand':5 'hand-held':4 'held':6 'led':9 'led-bas':8 'let':41 'let-out':40 'messag':29 'motorist':31 'office/plant':44 'out':42 'personnel':22 'roadblock':36 'safeti':15,21 'select':25 'self':2 'self-contain':1 'shift':45 'sign':17 'site':34 'textual':14 'traffic':20,27 'traffic-direct':26 'use':18 'user':12 'user-control':11

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