That is the other sad truth...the faster vehicle often defines how safe any roadway is...so the majority of the burden of safety is on the motorist. True the flow of traffic might be 45, but if it's a 35 zone, you should be going 35. I know how bad it sucks, but that's just the way it is. Now if a guy going 35 gripes about a cyclist going 20mph slower (15mph), well that 20mph is safer for both ends than the 30mph difference if drivers sped by the usual 10mph that is done on 35mph roads.
Things arent always one sided.