“But the path of the just is as the shining light, that shineth more and more unto the perfect day.”
Symbolism about walking or paths is common in scripture.
The general idea is that evil creates a dark jagged road which causes people to be lost or to fall.
Truth and godliness are compared to bright, straight or safe roads.
As stated here, following godly wisdom is like walking on a road lit by light of dawn, brighter and brighter until bursts into full day.
This is especially appropriate since Jesus, the sinless son of God, is defined as the ‘true light’. He called Himself ‘the light of the world’.
The apostle Paul also addressed the believers at Ephasus as ‘light in the Lord’ and exhorted them to ‘walk as children of light’ (Ephesians 5:8).
John also wrote that “God is light, and in him is no darkness at all” (1John 1:5).
As believers walk in the light, so that others see your good works and glorify your heavenly Father.