Shaikh Saaleh As-Suhaymi (may Allaah preserve him) said:

Secondly: The statement of the Prophet (sallal-laahu-alayhi-wasallam): “Beware! Avoid sitting on the roads.” (1) So if merely sitting on the roads is forbidden, then how about what those ones do by blocking the roads of the Muslims, obstructing their movements and ruining their (worldly) benefits. (2)

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(1) Saheeh Al-Bukhaari No: 5832. Here is the full text of the hadeeth: Narrated Abu Said Al-Khudri: The Prophet said, ‘Beware! Avoid sitting on the roads.’They (the people) said, ”O Messenger of Allaah! We can’t help sitting (on the roads) as these are (our places) where we have talks. The Messenger of Allaah (sallal-laahu-alayhi-wasallam) said: ”If you refuse but to sit, then pay the road its right’ They said, ‘What is the right of the road, O Messenger of Allaah? He said, ‘’Lowering your gaze, refraining from harming others, returning greeting and enjoining good and forbidding evil.’’ [For further benefits, see Sharh of this hadeeth by Shaikh Muhammad Ibn Abdillaah As-Subayyil (rahimahullaah) in book titled: (مِنْ هَدْيِ الْمُصْطَفى   )-pages 180-194]

(2) [Source: القُطُوفُ الدَّوانِيُّ فِي سَرْحِ نُونِيَّة الْقَحْطَانِيِّ – page332]