<P> The use of passing lanes for faster traffic is sometimes acknowledged with signs using phrases such as `` Slower Traffic Keep Right '' ( in Canada , where the passing lane is to the left ) . In a study by the AASHTO Subcommittee on Traffic Engineering , all 24 US states involved used some form of passing lane courtesy signage , 9 of which only use those signs for steep graded roads . </P>
<P> The use of passing lanes for faster traffic is sometimes acknowledged with signs using phrases such as `` Slower Traffic Keep Right '' ( in Canada , where the passing lane is to the left ) . In a study by the AASHTO Subcommittee on Traffic Engineering , all 24 US states involved used some form of passing lane courtesy signage , 9 of which only use those signs for steep graded roads . </P>
which lane is the passing lane in canada
which lane is the passing lane in canada
to the left
to the left