It's still illegal and god forbid that the undertaken vehicle moved across and there was a collision causing a death, you would be charged with causing death by careless driving.  Agreed. But probably a lesser sentence than punching them to death. 
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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