josetsusha josetsu sagyou chu
除雪車 除雪 作業中
じょせつしゃ じょせつ さぎょうちゅう
ジョセツシャ ジョセツ サギョウチュウ
This is one of tongue twisters phrases.
A tongue-twister is a phrase that is designed to be difficult to articulate properly, and can be used as a type of spoken (or sung) word game. Some tongue-twisters produce results which are humorous (or humorously vulgar) when they are mispronounced, while others simply rely on the confusion and mistakes of the speaker for their amusement value.
「除雪車除雪作業中」＝「Snowplow is working to snow removal」
[ josetsusha josetsu sagyou chu ]