Oh dear, you'll never be able to successfully fight the roading lobby or it's Parliamentary puppets if your're that poorly informed. Start with NZTA's NLTP allocations to Improvement of state highways in Bay of Plenty region
. It includes $800,000 for eight passing lanes, ergo $8.3m should be enough for 80 passing lanes, except it won't because the big money is still being spent building more motorways in Tauranga. Alternatively $8.3m should be enough to bring 80 bridges up to modern seismic standards, or maybe to provide touring cyclists with 2m wide hard shoulders to ride on for the whole length of SH5, possibly with rumbles strips to remind car drivers of their place on the road.
But they're no more likely to be funded than the re-opening of rail line. I haven't been able to find the consultants report online. From the streetview screenshots
I've seen of the tracks the project looks like a better employment boosting project than any of SH5 improvements.
Unfortunately the news in today's Daily Post
Actually, the only thing NZTA is going to spend $8.3m on in that SH5/railway corridor is to fix the damage done over the next 14 years by the 40 trucks a day that will continue using SH5 if the line isn't reopened to daily freight trains.