I think that your proposed rule could be applied based on the lowest class of the roads forming the angle. Streets, dirt roads, and parking lot roads may have such sharp turn angles. Freeways never do.robindlc wrote:... (lets say less than 30 grades)? A kind of warning, "Turn with too low angle, pls check"
Ramps junctions probably are where this type of error occurs most.
I consider going straight to be an angle (course deflection) of 0.
Turning left or right in a perpendicular intersection is an angle of 90°.
You are talking about a turn greater than 150°.
After you have checked a turn that is greater than 150° and see that it is fine, then what?
U-turns in bowtie intersections sometimes are very tight because of the need to have a nearly parallel interception angle to get the correct turn instructions.
Re: too sharp angle turn