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Traffic Safety Mobility Permit

What is Traffic Safety and Mobility (TSM) Division?

Traffic Safety and Mobility (TSM) conducts street lighting and traffic impact analysis where they assess how a project, like a new building or road modification, will affect traffic flow and safety at nearby intersections, specifically considering the impact of street lighting on visibility and pedestrian safety at night

Who Gives the Permits?

If your property is in unincorporated LA County, you’ll work with LA County Public Works.  If your property is in a city, another office may handle your permit.

What are Common Types of Permits?

  • Residential Permits: Homes, garages, fences, and decks.
  • Commercial Permits: Offices, stores, and restaurants.
  • Special Permits: Pools, signs, solar panels, and retaining walls.

Land Development Offices

We are here to help you get the permits you need for your building projects. LA County Public Works offers building services to:

  • 10 District Offices for unincorporated communities.
  • 9 City Offices for incorporated cities.
Find Your Nearest Office

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Do you have questions?  Need help with your project?

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Apply for Permit and/or Plan Check Online Using EPIC-LA

What is EPIC-LA?

EPIC-LA is Los Angeles County’s online system for managing permits and inspections. It helps residents, businesses, and developers oversee their building projects from start to finish. Whether you’re constructing a home, upgrading your property, or planning a large project, EPIC-LA provides a centralized platform to handle all permitting needs. Take a look at the major features of EPIC-LA below.

Application

Use EPIC-LA to submit the application for your permit and inspection online

Application

Apply online for all your permitting and inspection needs

Document Upload

Submit electronic copies of all your plans and supporting documentation

Fee Payment

Pay all permit and inspection fees electronically

Status

Use EPIC-LA to track and manage the progress of your application

Status Updates

Receive comments and notifications electronically

Contacts

Gives others access to real-time feedback, comments and notifications.

Collaboration

Allow collaboration between the Department, applicants, and design teams

Request Street Lighting and Traffic Impact Analysis Using EPIC-LA

Step 1: Start Your Project

  1. Apply through EPIC-LA using the Department of Regional Planning (DRP) Base Application form.
    • DRP is the planning department for all areas outside a city in LA County. They provide all major planning functions for unincorporated areas. They help write long range plans, review development projects, and respond to zoning complaints.
  2. Pay the initial DRP required fees.
  3. DRP will review project and consult with County departments (e.g., Public Works, Fire, Parks & Rec) as necessary.

Step 2: Regional Planning Creates a Project and Refers Project to LDD if Required

  1. DRP will assign your project a case number (RPPL) to LDD to review the tentative maps, site maps, or project concepts.

Step 3: LDD Reviews Your Project

  1. Depending on your project, one or more LDD teams will review your maps and plans. Your project may be referred to Traffic Safety & Mobility (TSM) at this time.
  2. After review, LDD will send comments and conditions back to DRP.

Step 4: Submit Required Studies

  1. Based on the review comments, identify and submit any required studies needed before tentative map approval.
  2. Required studies may include:
  3. TSM will review these studies.
  4. Address any TSM comments or requests for additional information.

Step 5: Make Project Changes if Required

  1. DRP and Land Development will work with you to address all feedback, including:
    • Comments on your plans
    • Results from your studies
  2. This process continues until your tentative map or project plans are approved (either through public hearing or administrative approval).

Step 6: Submit Plans to Public Works

  1. After your tentative map is approved, submit your detailed plans and required studies to Public Works through EPIC-LA.
  2. Create a plan case in EPIC-LA, where reviewers can track updates and send comments.
  3. See sample conditions and guidelines below for your submittal:

Step 7: Pay Required Fees and Deposits

  1. Pay the required fees through EPIC-LA.

Step 8: Traffic Safety and Mobility (TSM) Assigns Reviewers

  1. TSM will assign reviewers to check your plans and coordinate with other divisions as needed.

Step 9: Work Through Plan Reviews

  1. TSM reviewers collaborate with you to make corrections and get your plans approved.
  2. Each division may ask for additional documents or updates.

Step 10: Submit Final Maps (For Subdivisions Only)

Note: This step applies only to parcel maps and tract maps. It does not apply to other projects like single lot permits, etc.

  1. Once all conditions and corrections are met, submit your final map for approval (Guide for the Preparation of Final Maps & Parcel Maps)
  2. Land Development (LD) confirms clearances from all reviewing departments.
  3. After final approval,  Land Development (LD)  submits your map to the Registrar-Recorder/County Clerk’s office for recording.

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