Exhaust system as it cools.
the ticking is the blinkers
Sometimes a ticking sound is a valve lifter. The faster you go the faster the ticking will be. Make sure first it is not something stuck in a tire or something on the fan belt.
Something disastrous out come
Without the year, make or model of your vehicle it could be a bad compressor and or a bad compressor clutch.............
Anything. Mostly they would go under a vehicle or something.
It can be a hole in your exhaust system or it can have something to do with your engine.
Lifters ticking.
If you are driving the vehicle while ticking it could be that the engine mount is in poor condition.
If the vehicle has hubcaps remove them and see if the noise stops. Check the brakes as well, something on the wheels is rubbing.
Before I can answer that question, can you describe where the ticking noise is coming from? Front of the vehicle? Rear? Engine? Is it coming from your Wheels? If its coming from the front of the vehicle you might require an oil change. If its coming from the rear of the vehicle it could be your axle. If its coming from your wheels it could be either wheel bearings or a backing plate for your brakes. Does it happen at regular intervals? Are they random and sporadic?
Faulty engine
What causes ticking, check engine light, and the check gauges sensor to come on in a 1999 Dodge Durango 5.2L SUV?