going on all the time

fixed

continual; often repeated

never-ending, persistent

having, using, only one colour

fixed

without stopping

never-ending, persistent

in which traffic can move in one direction only

direct

without a bend or curve; level; even; upright; continuous; in good order; (of a person, behaviour, performance) honest; serious; (of alcoholic drink) without anything added; immediately

aligned; not curved

(of a storm etc) (continuing) without a decrease in strength

continuous, never-ending

going on, happening, all the time

incessant

not stopping

continual