Days Away, Restricted or Transferred (DART) Rate
Days Away, Restricted or Transferred (DART) Rate is a construction safety metric that counts injuries and illnesses leading to days away, restricted duties, or job transfers. In Intro to Civil Engineering, it shows how well a project is managing worker safety.
What is Days Away, Restricted or Transferred (DART) Rate?
Days Away, Restricted or Transferred (DART) Rate is the safety number civil engineers use to track serious job-site incidents that change a worker’s normal duties. If an injury causes someone to miss work, do restricted work, or move to another job task, it counts in DART.
In Intro to Civil Engineering, this term shows up in the construction safety unit because safety is part of project planning, not just an afterthought. A bridge project, highway project, or building site can have lots of hazards, and DART gives a quick way to see whether those hazards are turning into injuries that affect work performance.
The rate is calculated by taking the number of DART cases, multiplying by 200,000, and dividing by the total hours worked by all employees during the period. That 200,000 factor standardizes the result so different crews or companies can be compared even if they have different sizes or schedules. Without that normalization, a bigger company would usually have more incidents just because it has more workers and hours.
A lower DART rate means fewer incidents that forced someone off normal duties, so it usually points to a safer work environment. A higher rate can signal problems with training, protective gear, site housekeeping, equipment use, fall hazards, or the way the job is being supervised.
This metric does not tell you everything about safety by itself. One site might have a low DART rate but still have many near misses, which means the project is lucky rather than well controlled. That is why civil engineers look at DART alongside inspections, incident reports, and hazard controls instead of treating it like the whole story.
Why Days Away, Restricted or Transferred (DART) Rate matters in Intro to Civil Engineering
DART Rate matters in Intro to Civil Engineering because construction sites are full of risks that can slow a project, raise costs, and hurt workers. If you are designing a site plan or reviewing a safety report, DART gives you a concrete number for how often incidents are serious enough to change someone’s work status.
It also connects directly to project management. A crew with a rising DART rate may need better fall protection, clearer procedures, more training, or a different site layout. That means the metric is not just a record of past injuries, it is a signal that can shape future decisions.
Civil engineering classes use DART to connect safety culture with real project outcomes. Safety affects productivity, schedules, insurance, and compliance, so this one number helps you see how a construction site is performing beyond the blueprint.
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open one-pagerHow Days Away, Restricted or Transferred (DART) Rate connects across the course
Incident Rate
Incident Rate is a broader safety measure, while DART focuses only on injuries and illnesses serious enough to cause days away, restricted work, or transfer. If a problem set asks you to compare safety metrics, use Incident Rate for overall frequency and DART when the question is about more disruptive cases. The two numbers often appear together in construction safety reports.
OSHA
OSHA recordkeeping is what makes DART possible in many workplaces, because the needed injury and illness data has to be documented consistently. In civil engineering, OSHA rules shape what gets reported, tracked, and reviewed on a job site. If you see a safety case study, OSHA is usually the source of the reporting standards behind the metric.
Hierarchy of Controls
The Hierarchy of Controls is the framework civil engineers use to reduce hazards, and DART can show whether those controls are working. If DART stays high, it may mean the site is relying too much on PPE and not enough on elimination, substitution, or engineering controls. A safety analysis often links the metric to the control method that needs improvement.
Daily Walkthrough Inspections
Daily Walkthrough Inspections help catch unsafe conditions before they turn into DART-recordable injuries. They are the day-to-day check that can uncover missing guardrails, trip hazards, equipment problems, or poor housekeeping. When you connect the two terms, you can trace how routine observation affects the final safety score.
Is Days Away, Restricted or Transferred (DART) Rate on the Intro to Civil Engineering exam?
A quiz or case study may give you a site safety table and ask you to calculate DART, compare two projects, or interpret what the number says about job-site risk. You might also be asked to explain why a site with the same number of workers can have a different rate if total hours worked change. In a short response, use the formula, identify what counts as a DART case, and explain whether the result suggests improving or worsening safety conditions. If a question asks how a civil engineer would respond, connect the number to hazard controls, inspections, or training changes rather than just restating the definition.
Key things to remember about Days Away, Restricted or Transferred (DART) Rate
Days Away, Restricted or Transferred (DART) Rate tracks injuries and illnesses that force a worker to miss work, work with limits, or switch jobs.
The formula uses 200,000 hours as a standardizing factor, so different crews and projects can be compared fairly.
A lower DART rate usually means a safer site, but it should still be read with other safety data like inspections and near misses.
In civil engineering, DART is part of construction safety management, not just a paperwork metric.
If DART rises, it can point to problems with site conditions, training, equipment, or the way controls are being enforced.
Frequently asked questions about Days Away, Restricted or Transferred (DART) Rate
What is Days Away, Restricted or Transferred (DART) Rate in Intro to Civil Engineering?
It is a construction safety metric that counts injuries and illnesses serious enough to make a worker miss days, take restricted duties, or move to a different task. Civil engineers use it to judge whether a job site is keeping workers safe. It is one of the clearest numbers for comparing safety performance across projects.
How do you calculate DART Rate?
Multiply the number of DART cases by 200,000, then divide by the total hours worked by all employees during the time period. The 200,000 factor makes the rate easier to compare across projects of different sizes. If the hours worked go up but the case count stays the same, the rate goes down.
Is DART Rate the same as Incident Rate?
No. Incident Rate is broader and can include more kinds of recordable injuries or illnesses, while DART only counts cases that lead to days away, restricted work, or transfer. In construction safety, DART gives a narrower look at the injuries that most disrupt normal work. They are often used together.
Why would a civil engineering class care about DART Rate?
Because safety affects how a project is designed, staffed, scheduled, and managed. A high DART rate can reveal weak hazard controls, poor training, or unsafe site conditions. In class, you may use it to interpret a case study, analyze a safety report, or explain how a site could reduce risk.