Many timelapses these days use motorised dollys to add an additional dimension of movement in the footage. They are one of the best ways to create dynamic sequences, adding movement to an otherwise plain timelapse.
The market has exploded over the past few years, and there are now a wealth of commercially available dollies. They price in from around £900, to well over £6000. However, dollies are quite simple by design, and pretty easy to build yourself.