Is it need or needs?
- Highway 68 and Robinson Canyon Road need your support.
- Highway 68 and Robinson Canyon Road needs your support.
I voted needs.
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Coordinated subjects such as "John and Mary" or "Highway 68 and Robinson Canyon Road" are generally considered plural and are followed by a plural verb form: John and Mary are ... and Highway 68 and Robinson Canyon Road need ... .
Occasionally the compound is followed by a singular form:
My brother and best friend is in trouble.
Here the brother is the best friend. Since we are only referring to one person, the singular is needed.
Another example of a coordinated subject followed by a singular verb is when the two nouns are conceptualised as a single item:
Fish and chips is my favourite meal.
A cap and gown is mandatory for Commencement.
If "Highway 68 and Robinson Canyon Road" is conceptualized as a single project in need of support, then the singular verb (needs) could be used. If the two roads are conceived as separately in need of support, then the plural need is used.
Looking at it from the outside, I'd go for "need." Because there are two names and they are joined by "and," which are considered plural and therefore the base form of the verb "need" is appropriate.
But as Shoe mentioned, if the name is something that is written plural but refers to a single entity, then "needs" is the appropriate verb there.