Garmin 1090 Route Issue
Planning a trip north going through Baltimore in a Class A. Garmin route takes me through the McHenry Tunnel, which I am too wide for. Max width in the tunnel is 8' and my MH is 8.5'. Called and talk...
Forum Discussion
On tunnels and overhead clearance. Navteq (which supplies virtually all the data for all gps mfg) gets there data from published state data. Therein lies the problem. There is inconsistent data. In Oregon the published clearance height is the clearance at the minimum edge of the tunnel. But clearance in the normal roadway path is usually much more. Washiungton is similar.
As a result it will tell me I don't have clearance on several tunnels on federal highways that truckers use. But I do and it will try to either alter the route or warn me. Same with several other gps programs I have.
I've had similar issues with traffic lane widths. So the problem isn't garmin, it's the raw data that is published they have access to.
Now in the OP case it could very well be that published data they use hsow a traffic lane more than 8.5ft wide. hence it routes through the tunnel.
BTW if that tunnel is indeed only 8ft, I couldn't drive my truck through it without pulling in the mirrors and folding them against the truck.
Does the tunnel really only have a 8ft traffic lane? That would really be unusual. And a dually couldn't go through it either.
As a result it will tell me I don't have clearance on several tunnels on federal highways that truckers use. But I do and it will try to either alter the route or warn me. Same with several other gps programs I have.
I've had similar issues with traffic lane widths. So the problem isn't garmin, it's the raw data that is published they have access to.
Now in the OP case it could very well be that published data they use hsow a traffic lane more than 8.5ft wide. hence it routes through the tunnel.
BTW if that tunnel is indeed only 8ft, I couldn't drive my truck through it without pulling in the mirrors and folding them against the truck.
Does the tunnel really only have a 8ft traffic lane? That would really be unusual. And a dually couldn't go through it either.
