Using riba-based wealth to repair roads
Question

                Is it permissible for me to use interest based on riba to pave a road in the quarter where I live, because the state does not repair the roads in the old quarters of cities?.
Praise be to Allah.Putting 
    money in the bank in return for interest is a major sin, and it is not 
    permissible to put money in the bank in order to get interest to use for 
    charitable projects, let alone benefit from it oneself. 
If a Muslim 
    has put his money in a riba-based bank, then Allaah guides him and he 
    repents from riba, then he has to get rid of the interest by donating it to 
    charitable causes, because Allaah says (interpretation of the meaning): 
“O you 
    who believe! Be afraid of Allaah and give up what remains (due to you) from 
    Ribaa (from now onward) if you are (really) believers.
279. And 
    if you do not do it, then take a notice of war from Allaah and His Messenger 
    but if you repent, you shall have your capital sums. Deal not unjustly (by 
    asking more than your capital sums), and you shall not be dealt with 
    unjustly (by receiving less than your capital sums)”

    [al-Baqarah 2:278, 279]
It is not 
    permissible for him to benefit from it, either by paying taxes with it or 
    doing anything else that will bring him benefit. 
Based on 
    this, if this road belongs only to him, because it leads to his house, it is 
    not permissible to repair it using this money, because it brings benefit to 
    him. But if it is a public road which will benefit him and others, then 
    there is nothing wrong with using this money to repair it. 
And Allaah 
    knows best. 
See also the 
    answers to question no. 292,
    2370,
    20876,
    23346,
    22392,
    49677 and
    30798. 
And Allaah knows 
    best.