We have analyzed the zero field and high field transport properties of several underdoped high-T-c systems. A convincing scaling behavior of the temperature dependence of the resistivity has been found for all of them, thus proving that the underlying scattering mechanism remains the same as we approach the metal-insulator transition from the metallic side. The scaling temperature Delta grows substantially with the decreasing hole concentration x. We associate Delta with the opening of the spin-gap in the spin ladders appearing due to the stripe formation. Three distinctly different temperature regimes have been identified: (i) high-temperature Heisenberg-like 2D regime; (ii) intermediate temperature 1D stripe regime;: and (iii) low-temperature disorder-induced stripe fragmentation and pinning with an enhanced inter-fragment and inter-stripe hole hopping, which recovers an effective 2D weak localization with a logarithmic behavior of resistivity with temperature. This third regime has been revealed by suppressing superconductivity in fields up to 60 T. Hall conductivity data are used to estimate the evolution of the stripe "order parameter" and mobility with temperature in the normal state.