If you recall, the gasoline tax was intended to fund Interstates and US Routes, but the Democrats politely informed the States that the pseudo-federal government would no longer fund highway projects. The States would be solely responsible for the construction and maintenance of the Interstates and US Routes (except the Democrats conveniently forgot to cancel the gasoline tax and instead decided to use it for other fun things).
So for the last 40 years the States have been burdened with the cost of maintaining the Interstates and US Routes. Occasionally for new construction, a Democrat or Republican will attach an earmark to a critical bill to fund the cost of the "Bridge to Nowhere," the "Highway to Nowhere," the "Exit Ramp to Nowhere," the Bridge in the Middle of Nowhere." and the "Highway in the Middle of Nowhere that Nobody Uses" and other things.
In a recession, the Cities, Counties and States lose money due to the loss of payroll taxes. That is compounded for some Cities, Counties and States who double tax (just like your employer matches your Social Security Tax some Cities, Counties and States have levied matching contributions for payroll taxes on employers so that what you pay in taxes your employer pays too).
In addition to the loss of payroll tax revenues, the Cities, Counties and States lose sales tax revenues.
On top of huge losses in revenues, the Cities, Counties and States are also paying out massive amounts of money for social welfare benefits like unemployment, medicaid, food stamps and other programs.
As a result, the Cities, Counties and States either do not award construction contracts for Interstate/US Route maintenance as well local road maintenance and construction, and they also cancel or halt existing contracts.
What the stimulus did was help those governments offset loses and allow the awarding of contracts that were already planned and to continue those projects that were already underway.
The Truth is that existing jobs were maintained, not created.
Part of the Hopey Changey Obama scam is claiming that someone, like a construction worker, who was laid off and then called back to work is counted as "a newly created job" when in fact no new job was created.
Because of the severity of the recession to this point, the Cities, Counties and States have lost even more money, and are being forced to halt or cancel the awarding of construction/maintenance contracts, and this new "stimulus" is intended to offset that.
Again the end result will be that no new jobs are created, rather existing jobs will be kept, and perhaps those construction workers who were laid off will be called back to work for at least a few weeks.
A good example of the lies is the current maintenance on US 27/US 127 a few blocks away from me. That project was planned 3 years ago and is part of an ongoing maintenance plan for the last 8 years, so no jobs have been created in spite of the Hopey Change sign that proclaims to motorists using the route that the project is funded by the "stimulus."
Anyway, the $50 Billion stimulus will do nothing and the unemployment rate will still be 9+% for the remainder of the year and all of next year.