Hi, Kurviger is great application, only thing I miss is to avoid closed roads during navigating. There is free source for Czech republic, offered by National registry for traffic informations. Here is more info in ENglish http://registr.dopravniinfo.cz/en/sources/cz-ndic_d2-restrictions/
As there are many closed roads for construction works in whole country for some last years, I’d like Kurviger can use this informations for better planning.