Saw this at a state park and wondered what its name is. It's about 4' tall and wide and it is in bloom. Any help appreciated. Thanks!
Just a guess... flowering quince (Chaenomeles sp.) The pictures are a bit too overexposed and lacking detail for me to be sure.
Yes, what else would have spines and be blooming in January? Note that it is an Asian plant, not a native.
Flowering Quince (Chaenomeles sp.) is a commonly used extremely tough landscape plant - I'm not surprised you saw it at a rest stop. There are numerous named clones in colors ranging from white to pink to red (to all three on one plant) to a peachy orange called 'Cameo'.
This is par for the course performance - a warm snap in winter, and it busts into bloom.