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Based on the miscellaneous published radio and optical data, SDSS and APMcatalogue we consider the various properties of the giant radio sources (gRS)with the aim of refining the conditions leading to the formation of theseobjects. We compare gRSs with the regular-sized radio sources in radio andoptical bands, yielding the following results: 1. The fraction of broad lineobjects among gRSs with high excitation spectrum is the same as for the RSsfrom isotropic samples. According to Unified Scheme this leads to the isotropicangle distribution of gRSs jets, thus gRSs cannot be characterized as objectswith jets lying in the plane of sky. 2. gRSs do not differ from normal sizedRSs in apparent asymmetry distribution of their extended radio components(ERC). However the fact that asymmetry distributions for gRSs and giant radioquasars (gQSS) are essentially the same leads within the Unification Scheme tothe conclusion that the origin of this asymmetry is in the non-uniformenvironment. 3. The richness of the environment for gRSs is the same as fornormal sized RSs. This contradicts the opinion that the low density of theenvironment is the single reason for gRSs formation. 4. About 10% of FRII RSshave by order of magnitude longer lifetimes and eventually evolve to gRSs. 5.The observed relative quantity of radio quasars in gRSs population (~0.1) canbe interpreted as the presence of long-living population of radio loud QSSs as~0.1 of all radio quasars.

Giant Radio Galaxies - old long-living quasars?