illegal migrants blocking important roads and bridges

From Vakola I was going towards Ghatkopar via Military camp and Air India Colony. The bridge on way was very small so they have after years of work ( it should have taken 2 - 3 months) made one additional bridge. Same is not put to use as is used by car thieves who have parked over 150 cars and their skeleton. Whole stretch dominated by a illegal migrants is encroached upon and blocking movement of traffic but no police, BMC, Shivsena or BJP has guts to improve condition there. Similarly half  Bridge landing coming from Mahim west to Dharavi is blocked by illegal migrant scrap merchant and no one has guts to reclaim that part of bridge and put it to use.