It is now common practice to install an approved crash tested end terminal on the departure side of a barrier system on an undivided road. This is recognition that vehicles leave their lane to the other side of the road, and the trailing end of the terminal presents a crash risk. 

For the barrier itself we always overlap the rails in the direction of travel for the adjacent lane (to minimise the risk of snagging as a vehicle impacts/pockets the system). This is the same for the leading terminal, however the trailing terminal is the other way around. This is to ensure that the terminal functions as crash tested. This is for the length of the terminal and its splice joints.