Presented here are observations, analysis and interpretation of five Fanaroff-Riley class I radio galaxies. Total intensity and polarised emission was observed in each source at 6 and 3 cm at angular resolutions of 16 to 2 arc seconds. These sources have a flux density greater than 1 Jy at 843 MHz, are 10-30 arc minutes in total angular extent, have redshifts between 0.011 and 0.035, are south of declination –43 degrees and have bright prominent jet structure. Images of the distribution of total intensity, polarised intensity and magnetic field configuration are presented and analysed. Physical properties in the jets and lobe are estimated using a number of different techniques. The observations have revealed a wide variety of structures, which imply many types of physical processes occurring in these sources, and different types of environments the jets travel through. The surface brightness distribution of some FR I radio galaxies with some characteristics of FR II galaxies are found to be consistent with the jets traveling through flat pressure gradients possibly caused by the presence of a cocoon surrounding the source. Analytical model imply jets with Mach numbers of 1-5, and jet velocities of approximately 1,000-20,000 km s-1 along most of the jets but mildly relativistic velocities 0.1-0.5c are indicated by Doppler boosting models at the base of most of the jets / Doctor of Philosophy (PhD)