Not just Dallas. Dutch police are actually given financial targets to meet each year for traffic violations, split by category (speeding, red lights, etc.) as well as targets for impounded vehicles (which are sold for profit by the government), impounded driver's licenses (which mean someone needs to take another driving test, fee to go to the government), etc.

The grand total of all those fines is something like several hundred million Euro per year, a decent sized chunk of the total government budget.
And they still maintain that those fines are only "to promote road safety by making people think twice about violating the law".