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We present the CFHTLS-Archive-Research Survey (CARS). It is a virtualmulti-colour survey based on public archive images from the CFHT-Legacy-Survey.Our main scientific interests in CARS are optical searches for galaxy clustersfrom low to high redshift and their subsequent study with photometric andweak-gravitational lensing techniques. As a first step of the project wepresent multi-colour catalogues from 37 sq. degrees of the CFHTLS-Widecomponent. Our aims are to create astrometrically and photometrically wellcalibrated co-added images. Second goal are five-band (u*, g', r', i', z')multi-band catalogues with an emphasis on reliable estimates for objectcolours. These are subsequently used for photometric redshift estimates. Thearticle explains in detail data processing, multi-colour catalogue creation andphotometric redshift estimation. Furthermore we apply a novel technique, basedon studies of the angular galaxy cross-correlation function, to quantify thereliability of photo-z's. The accuracy of our high-confidence photo-z sample(10-15 galaxies per sq. arcmin) is estimated to $\sigma_{\Delta_z/(1+z)}\approx0.04-0.05$ up to i'<24 with typically only 1-3% outliers. Interested users canobtain access to our data by request to the authors.

CARS: the CFHTLS-Archive-Research Survey; I. Five-band multi-colour data from 37 sq. deg. CFHTLS-Wide observations