I do hope that both of you carry cell phones!! And lots of water!!
As to the shades, the angle would have to be thought out carefully, thinking of the air flow. Think of how a hat flops down when you are driving fast, that might make you think of making it in a cigar shape in front. I'd do a lot of Internet checking to see if anyone else has done this.
Maybe you could think of having very light aluminum pipes bent in a gentle curve, with spaces on it to attach the uprights, which should be at least 3 for balance.