Como dizer "dar a preferência" em inglês

Dar a preferência (no trânsito) = to give way



For instance:
"When you're turning right from the bottom of a T-intersection with no signs or signals, you will need to give way to all vehicles at the top of the T.".

You can find much more information here: http://www.nzta.govt.nz/traffic/around- ... -rule.html

In the above link, you can also find this very informative video about two give way rules that have just changed in New Zealand:
Hope it helps!